In this way, there are a total of 3 electron density regions around the central N-atom in the Lewis structure of. Draw the Lewis structure for PO43- and determine its electron and molecular geometries. electron pair geometry c. If you are not sure if your structure is correct, do a formal charge check. OF2 has a bent shape and a tetrahedral electron geometry. The negative 1 charge present on the ion accounts for 1 extra electron added in its Lewis structure. number of electron groups b. Ammonia is a hard base (HSAB theory) and its E & C parameters are E B = 2. Then we write the rest of the formula being. Skip to document. Take ::O=C=O:: for example. polarityResonance is a mental exercise within the Valence Bond Theory of bonding that describes the delocalization of electrons within molecules. For the SnCl4 structure use the periodic table to find the total number of valence el. Decide which is the central atom in the structure. . . It consists of one Hydrogen atom and three Oxygen atoms. For the molecule [H3O]+ give the following: Lewis Structure (include normal, wedge, and dotted lines when necessary), Number of valence electrons, Number of bonded atoms on central atom, Number of lone pairs on central atom, Central atom steric number, Bonded-atom lone-pair arrangement (BALPA), Bond angles, Hybridization, Number of sigma and. The electron configuration of a Phosphorus atom in its ground state is 1s2 2s2 2p6 3s2 3p3, but when it is in an excited state, the electrons from 3s orbital get unpaired. ClO3- or chlorine trioxide or chlorate is a monovalent inorganic anion that is soluble in water. Bueno, habiendo visto lo anterior. The O=N-O bonded atoms form a mutual bond angle of 134°. Chemistry. Lewis Structure: The simplest covalent compound has two different atoms forming one covalent bond through a sharing of one valence electron pair. A step-by-step explanation of how to draw the SCN- Lewis Structure (Thiocyanate Ion). Lewis structure :-. The steric number of Xenon central atom in the XeO3 molecule is 4, thus, it forms Sp 3 hybridization. A solution is prepared by adding 50. . 5. The total valence electrons of HClO are 14. N2O4 Lewis Structure, Molecular Geometry, Hybridization, MO Diagram, and Polarity. Resonance structures are used when a single Lewis structure cannot fully. Adding together the formal charges on the atoms should give us the total charge on the molecule or ion. . 45 g/mol. 5/5. Steps for Identifying the Strongest Types of Intermolecular Forces: Step 1: Draw the Lewis structure for each molecule. 96 Å, respectively. In an ether functional group, a central oxygen is bonded to two carbons. The total valence electrons available for drawing nitrite [NO2]– ion Lewis structure are 18. Zumdahl. There is a N=O bond in nitric acid lewis. The molecular geometry or shape of NO 2– is bent or V-shaped. A step-by-step explanation of how to draw the SnCl4 Lewis Dot Structure. BeCl2 Lewis structure, Molecular geometry, Hybridization In an sp-hybridized carbon, the 2s orbital combines with the 2p x orbital to form two sp hybrid orbitals that are oriented at an angle of 180°with respect to each other (eg. In carbonate ion, among the two elements, Carbon has an electronegativity. Although these two Hydrogen atoms are arranged symmetrically in the plane, the two lone pairs of electrons on the Oxygen atom push. #chemistry #chemistrylovers. glycerinStudy with Quizlet and memorize flashcards containing terms like (A) H2O(B) NH3(C) BH3(D) CH4(E) SiH4 Has a central atom with less than an octet of electrons, (A) H2O(B) NH3(C) BH3(D) CH4(E) SiH4 Has two lone pairs of electrons, (A) CH3CH2CH2CH3(B) CH3CH2CH2OH(C) CH3COCH3(D) CH3COOH(E) CH3CH2CH2NH2 Is isomeric with. None of the atoms bears a formal charge, and all atoms have octets (except for hydrogen atoms, which have duets). The Lewis dot structure are the diagrams that represent the valence electrons of atoms in a molecule. 7 kJ/mol), (6. LEWIS STRUCTURES PRACTICE WORKSHEET Draw the Lewis Structures for each of the following molecules. Question: Draw the Lewis structure for the polyatomic amide (NH2) anion. How many lone pairs of electrons are in the electron-dot structure of H2O? 2. Watch this video to know the accepted Lewis Structure of H3O+. 66 and 3. As this is a cationic molecule thus, C = 1. The latter increases with molecular weight and. Drawing correct lewis structure is important to draw resonance structures of CO 3 2-correctly. In the H 3 O + Lewis structure, there are three single bonds around the oxygen atom, with three hydrogen atoms attached to it, and on the oxygen atom, there is one lone pair. A step-by-step explanation of how to draw the NH3 Lewis Dot Structure (Ammonia). 67 estimate) = -0. The difference between the atom's number of valence electrons and the number it owns is the formal charge. Include all lone pairs and charges as appropriate. Thus by the formula, V = 6. the amino acid serine: urea: pyruvic acid: uracil: carbonic acid: A compound with a molar mass of about 28 g/mol contains 85. 91. . Steps for Writing Lewis Structures. A) tetrahedral / planar B) tetrahedral / trigonal pyramidal C) planar / planar D) trigonal planar / linear E) linear / linear + Click to draw a new structure. Question. here the structure of the molecule is as. A step-by-step explanation of how to draw the NH3 Lewis Dot Structure (Ammonia). Craig Beals shows how to draw the Lewis Structure for the Hydronium Ion. A step-by-step explanation of how to draw the BH3 Lewis Dot Structure (Boron Trihydride). E) pyramidal / pyramidal. The Lewis structure for PO 43- has 32 valence electrons available to work with. If resonance structures are needed to describe the Lewis structure, draw all possible resonance structures. It discusses the molecular geometry, bond angle,. Expert Answer. The steps that must be followed while drawing a Lewis structure are listed. HNO 3 (Nitric acid) Lewis Structure. HNO 3 (Nitric acid) Lewis Structure. 93 CH: 120EXR¹ i ?. Instant Text Answer Video Answers to Similar Questions Best Matched Videos Solved By Our Top Educators 02:36 BEST MATCH Draw the Lewis structure for each molecule. Step 2: Find the number of octet electrons. There are five half-filled orbitals: one s. Explain How Examples: H 2 S, NCl 3, OH -. cl se 4. Ethanol, C 2 H 5 OH, is used extensively as motor fuel in Brazil. Publisher: Cengage Learning. uncharged Correct answer: c In the compound sodium methoxide (NaOCH3), there is _____ bonding. H3NO is a chemical formula for hydroxyl amine. Study with Quizlet and memorize flashcards containing terms like , Lewis structure of Cl₂. To properly draw the N 3– Lewis structure, follow these steps: #1 Draw a rough sketch of the structure. Show transcribed image text. Exercise 2. It is used to show how the electrons are arranged around individual atoms in a molecule. It gives a quantum mechanical approach to the forma…. 01:19. For the H3O+ structure use the periodic table to find the total number. The Lewis structure, also known as an electron dot structure, is a diagrammatic representation of determining the total number of valence electrons present in an atom that are ready to form bonds to form a molecule and, eventually, a compound. Total valence electrons = 6 + 18 + 2 = 26. A step-by-step explanation of how to draw the H3N Lewis Dot Structure (Hydrazoic acid). Hydrogen contributes one electron, carbon has 4 and oxygen contributes 12 electrons (6 electrons each by 2 oxygen atoms). Expert Answer. There are 2 steps to solve this one. All atoms now have octet configurations. XeO3 is a polar molecule. Ammonia forms 1:1 adducts with a variety of Lewis acids such as I 2, phenol, and Al(CH 3) 3. In 1923, G. Use these steps to correctly draw the HClO 3 Lewis structure: #1 First draw a rough sketch #2 Mark lone pairs on the atoms #3 Calculate and mark formal charges on the atoms, if required #4 Convert lone pairs of the atoms, and minimize formal charges #5 Repeat step 4 if needed, until all charges are minimized, to get a stable Lewis structureCarbon forms one single bond with the Hydrogen atom and forms a triple bond with the Nitrogen atom. So, the carbon atom has tetrahedral molecular geometry and tetrahedral shape also it has sp3 hybridization. 1a) Draw a Lewis structure for each molecule shown below. Now, let's look at the cationic form of methanol, CH3OH2+. Buchwald-Hartwig Amination Reaction 19m. Total number of electrons of the valance shells of CO 3 2-Carbon is located at group 4 in the periodic table. There are six electron groups around the central atom, each a bonding pair. The molecular geometry or shape of NO 2– is bent or V-shaped. . #1 Draw a rough sketch of the structure. 1. Unlock. BondingOrbital Shape And Hybridization OfDraw the molecular orbital energy diagram for oxygen H3O+ Lewis Structure, Geometry, Hybridization, and MO Atomic orbital - Wikipedia The p z orbital is the same as the p 0 orbital, but the p x and p y are formed by taking linear combinations of the p +1 and p −1 orbitals (which is why they. Explanation: Lewis Structure of H3O+. Expert Answer. . . The h3o+ lewis structure is drawn by the following step: For the h3o+ lewis structure study about the periodic table, we will calculate the valence electrons present in hydronium ion from the periodic table. . A step-by-step explanation of how to draw the O2 Lewis Dot Structure (Oxygen Gas (Diatomic Oxygen). In the case of CH3Cl, there are only two single atoms C and Cl, where their electronegativity values are 2. 2. 0 °C; The molar mass of SF4 is 108. The Lewis structure is a diagram that illustrates the arrangement of atoms, bonding electrons, and l. VSEPR VSEPR calculation for H 3N → B F 3 Since B F 3 is deficient two electrons from the octet, a characteristic reaction is to react with lone pair donors. Ammonia has 4 regions of electron density around the central nitrogen atom (3 bonds and one lone pair). Lewis structure exercises. Three fluorines are bonded to a central bromine. Complete the Lewis structures of these molecules by adding multiple bonds and lone pairs. A step-by-step explanation of how to draw the HOF Lewis Dot Structure (Hypofluorous acid). I present three ways and use formal. Structure, properties, spectra, suppliers and links for: Ammonia, 7664-41-7, 69718-51-0. For selecting the center atom, you have to remember that the atom which is less electronegative remains at the center. Count the valence electrons fro all atoms, and add or subtract electrons according to the charge. 58(2) Å. Examples: CH 4, NH 3, I 2. . 26 (Mean or Weighted MP) VP(mm Hg,25 deg C): 1. (1 point) b. Answer. It's n. Acetone is considered to be the simplest form of Ketone. Include all lone pairs of electrons. I present three ways and use. For the SnCl3 - structure use the periodic table to find the total number of valenc. It involves constructing multiple Lewis structures that, when combined, represent the full electronic structure of the molecule. Figure 15. Lewis structure of NH 3 can be drawn by starting from valence electrons of nitrogen and hydrogen atoms in several steps. 1. 4. I quickly take you through how to draw the Lewis Structure of boron hydride, BH3. Therefore we only have 8 valence electrons for the H3O+ Lewis structure. All these covalent bonds have same length due to resonance. We'll also compare HNC to HCN and discuss why both are of inter. Use Lewis structures to show how electron pairs move and bonds form and break in this reaction, and identify the Lewis acid. Draw a skeleton structure in which the other atoms are single-bonded to the central atom: "O-Se-O" 3. H3O+ is tetrahedral because when drawing the lewis structure, there are a total of 8 electrons, and so oxygen should have 3 bonds (to hydrogens) and then one lone pair, which means there are four regions of electron density about the central atom, which means the molecular geometry is tetrahedral, but the shape is trigonal pyramidal. Since all the atoms are in either period 1 or 2, this molecule will adhere to the octet rule. 4. In hydronium ion, the central atom is oxygen and it has 6 valence electrons. A step-by-step explanation of how to draw the CCl2O Lewis Dot Structure. Example 1. For example, if we want to obtain the Lewis structure of the Sulfate ion, SO 4 – 2, we must first enter the. The oxidation state of the nitrogen atoms in hydrazoic acid is fractional and is . Answer. Step 1. The lewis structure is a representation of velance electron in a m. It is the reason why the bond angle that. Phosphorus pentafluoride is a Lewis acid. The boiling point is -112 °C. C2H4. A step-by-step explanation of how to draw the Lewis Dot Structure for Carbon dioxide (CO2 ). total valence electron number in CO32- is. . PF5 Hybridization. When you count the valence electrons for every atom, you will find that only the left and middle structure satisfy the octet / duet (for hydrogen) rule, i. Select answers to see the correct drawings. N2. And hence, the above lewis structure of C3H6O (i. The Lewis structure of the triatomic H2O molecule shows two single sigma bonds between the oxygen atom and the hydrogen atoms. Lewis Structures. 7% carbon and 14. Lewis Symbols. We call this atom a central atom and it is bonded. . It is used to show how the electrons are arranged around individual atoms inside a molecule. Three bromine atoms form covalent bonds with the central phosphorus atom, leaving the phosphorus atom with one lone pair. For the BrF5 Lewis structure the total number of valence electrons (found on the periodic table) is 42. Structure, properties, spectra, suppliers and links for: Ammonia, 7664-41-7, 69718-51-0. It is the reason why the bond angle that. H4N. C 3 H 8 O 3. As the Carbon (C) atom has a lower value, so it will be the central atom. The O=N-O bonded atoms form a mutual bond angle of 134°. More water is added until the final volume is 1. Step 2/3. And to help you understand the Lewis Structure of this molecule, we are going to share our step-by-step method. Fukuyama Coupling Reaction 15m. #3 Indicate formal charges on the atoms, if necessary. The Lewis structure of CH3O, also known as methoxy, is a representation of the molecule that shows the arrangement of its atoms and the bonds between them. For resonance structures there must be a double or triple bond present, which is. A Lewis Structure is a representation of covalent molecules (or polyatomic ions) where all the valence electrons are shown distributed about the bonded atoms as either shared electron pairs (bond pairs) or unshared electron pairs (lone pairs). Molecule Lewis Structure # of atoms bonded to central atom # of lone pairs on central atom Total # of e-groups around central atom Electron pair geometry Molecular geometry Bond angle(s) Is the molecule polar? 1 5 XeF 4 1 6 XeOF 4 1 7 PF 3 1 8 SO 4 2- 1 9 NO 3 1- 2 0 HCN . Hydrogen Cyanide is a polar molecule. Understanding the Lewis structure of CH3O is important in predicting the molecule’s chemical. It consists of three carbon atoms, six hydrogen atoms, and one oxygen atom. Acetonitrile also called cyanomethane or methyl cyanide is a chemical compound with the molecular formula CH3CN. e. polarityResonance is a mental exercise within the Valence Bond Theory of bonding that describes the delocalization of electrons within molecules. For CaS we have an ionic compound and we need to take that into account when we draw th. This is a clip from the complete video: Covalent Bonding 2. تركيب لويس . Its relative donor strength toward a series of acids, versus other Lewis bases, can be illustrated by C-B plots . . Have a look! ICl3 Polarity. Step 1. Status: Low Normal High Extreme. Adding together the formal charges on the atoms should give us the total charge on the molecule or ion. The structure of second type is stable for compound. Oxonium | H3O+ | CID 123332 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards. 2. SO3. In order to calculate the formal charges for BF3 we'll use the equation:Formal charge = [# of valence electrons] - [nonbonding val electrons] - [bonding elec. 6℃ and 76. 1: The structure (a) and the typical view of the three-centered two-electron bonds (b) in diborane, B 2 H 6. . · 1 · Oct 23. Determine the number of valence electrons in CH2Cl2 and then draw the corresponding Lewis structure. The B−N distance is 1. The sulfur (S) is present at the center of the molecular ion while oxygen (O) occupies the terminals, one on each side. 3 hydrogen atoms are bonded to oxygen, so the number of the monovalent atoms (M) = 3. VSEPR VSEPR calculation for H 3N → B F 3 Since B F 3 is deficient two electrons from the octet, a characteristic reaction is to react with lone pair donors. Oxygen is located at 6 th group. The ion acquires a positive charge afte. For a molecule, we add the number of valence electrons on each atom in the molecule: SiH 4 Si: 4 valence electrons/atom × 1 atom = 4 + H: 1. Structural formula of carbon dioxide. Expert-verified. This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. consider Lewis structure of the hydronium (H3O+) ion. What are the angles a and b in the actual molecule of which this is a Lewis structure? H 1₁ b = [° H a = H a :O: b Note for advanced students: give the ideal angles, and don't worry about small difference caused by the fact that different electron groups may have slightly different sizes. For the H3CCN Lewis structure, calculate the total number of valence electrons for th. A shared pair of electrons is represented as a short line (a single bond). See the Big List of Lewis Structures. Press ALT+A to get to the bonds and electrons editor. Draw a Lewis structure tor NHF_2 in which the central N atom obeys the octet rule, and answer the following questions based on your drawing. Dinitrogen tetroxide (N2O4) is commonly known as nitrogen tetroxide (NTO). Here, I’ll. Structural Formula. Draw a Lewis structure for C3H6O, and C2H8O. View the full answer Step 2. The NO2 Lewis structure has a total of 17 valence electrons. Draw the Lewis structure for. Plus, there is a positive (+1) charge on the oxygen atom. You can see in the above image that all the. The RCSB PDB also provides a variety of tools and resources. The Lewis structure of a molecule provides a visual representation of the arrangement of atoms and electrons. Thus, central carbon atom has hydrogen carbon hydrogen. This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Step 1. For the SnCl4 structure use the periodic table to find the total number of valence el. Transcribed image text: Draw the Lewis structure for H30*. Hydronium is the positive ion present in Arrhenius acid solutions. Hydrazoic acid, also known as hydrogen azide or azoimide, is a compound with the chemical formula HN 3. The B−H and N−H distances are 1. The total number of valence electron ( T V E) for the given compound will be, T V E = Valence electrons of ( C + 3 H + C + O + C + N)DO NOT FORGET TO SUBSCRIBE!LinkedIn: step-by-step explanation of how to draw the HNO3 Lewis Structure (Nitric Acid). Once we know how many valence electrons there are in BrF5 we can distribute them around the central atom with the goal of filling the outer shells of each atom. Oxygen, Nitrogen, Carbon, and Halogens tend to. Study with Quizlet and memorize flashcards containing terms like Which term describes a substance that increases the concentration of hydroxide ions in solution. Expert Answer. . ‘+’ stands for positive charge i. Understanding the molecular structure of a compound can help determine the polarity, reactivity, phase of matter, color, magnetism, as well as the biological activity. Steps. A Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. This is a key first step for drawing Lewis dot s. Acidic substances liberate H + ions in an aqueous solution. As both the central atoms of CH3NH2 lewis structure i. . Question: In this question you will be asked to draw several Lewis structures and determine the geometry, bond angle, and hybridization about the central atom. 4-1. Hydrogen bromide is an anhydrous gas with no colour having strong irritating smell. (1 valence electron on isolated atom) - (0 nonbonding electrons) - (½ x 2 bonding electrons) = 1 - 0 - 1 = 0. To find formal charges in a Lewis structure, for each atom, you should count how many electrons it "owns". Acetonitrile (CH3CN) lewis dot structure, molecular geometry, polar or non-polar, hybridization. In order to draw the lewis structure of NH2- ion, first of all you have to find the total number of valence electrons present in the NH2- ion. In chemistry, hydronium ( hydroxonium in traditional British English) is the common name for the cation [H3O]+, also written as H3O+, the type of oxonium ion produced by protonation of water. Step #1: Draw the lewis structure Here is a skeleton of H3O+ ion lewis structure and it contains three O-H bonds. Exercise 10. Find the total valence electrons for the molecule. Exercise 8. and draw the Lewis structure. H3C. Step 5: Draw it! Step 6: Add lone pairs. The tendency to form species that have eight electrons in the valence shell is. So the formal charge on carbon is zero. for given question [1st] lewis structures of the following compound. In the Lewis structure of HNO, the nitrogen atom is the central atom, with the hydrogen and oxygen atoms bonded to it. (2) Draw single bonds between bonded atoms. For the NH3 structure use the periodic table to find the total number of valence electrons for the NH3 molecule. Now, in order to draw the Lewis Structure, we have to determine which one is the central atom in a multiatomic heterogeneous molecule, here an ion. Summing up. number of electron groups b. 2. Expert Answer. Terminal atom. The decomposition of aqua regia but are constantly shifting, breaking and to. The HClO Lewis dot structure shows that oxygen is the central atom that is forming single covalent bonds with chlorine and hydrogen H-O-Cl. This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Step 1: Find the central atom: Usually, single-atom with the least electronegativity becomes the central atom. Be sure to. Lewis structure of hydronium ion (H 3 O +) contains three O-H bonds. 1. IN-2X5 Lewis Structure Resonance Structures (if any) Sep H H- + CI H م O: H 10 N=N: H none Electron Pair Geometry Molecular Geometry (bond angle) EPG = tetrahedral MG= tetrahedral (109. If the Lewis structure must have nonzero formal charges, the arrangement with the smallest nonzero formal charges is preferable. How to draw Lewis Structure for H 2 O; Molecular Geometry of H 2 O; Hybridization. Step 7: Figure out which atom is charged. For the O2 structure use the periodic table to find the to. Which of the following is a base-conjugate acid pair? H2O and H3O+. Nitrate or NO 3– is a polyatomic ion with molecular mass 62. The molecular geometry or shape of NH 3 is a Trigonal pyramidal. electron pair geometry c. Video: Drawing the Lewis Structure. Lewis acids extract one or more hydroxyl ions from water to release hydrogen ions, which, again, form hydronium ions. There is +1 charge and one lone pair on oxygen atom in H 3 O + lewis structure. a. 2. Ali3, also known as aluminum triiodide, consists of one aluminum atom and three iodine atoms. Step #1: Calculate the total number of valence electrons. The H+ ion and conjugate base are produced by the H3O+ Lewis structure in. The Methane (CH4) lewis structure is made up of one carbon atom that is situated at the middle position and four hydrogens atoms that are at the surrounding position. PCl3 is a toxic liquid with an unpleasant smell. In this structure, the carbon atom is bonded to three hydrogen atoms and one oxygen atom. For the HC2- structure use the periodic table to find the total number of valence elec. ). When we have an H (or H2) in front of a polyatomic molecule (like CO3,. You should consult the Lewis structure rules and a periodic table while doing this exercise. A step-by-step explanation of how to draw the HC2- Lewis Dot Structure. H30. Note that the + sign in the Lewis structure for H3O+ means that we have lost a valence electron. Here, the given ion is CO3 2- ion. Find the total valence electrons for the molecule. A step-by-step explanation of how to draw the NO2 - Lewis Dot Structure (Nitrite ion). And this plus sign means we've lost a valence electron, we've lost a negative charge. Draw the Lewis structure for H2O. The Lewis structure is a diagram that illustrates the arrangement of atoms, bonding electrons, and l. ClO3- appears to be a wet substance mostly a solid which has. Here it is 24-10 = 14, that is 7 lone pairs. Question: Draw a Lewis structure for [H3O]+. In an H2O molecule, the Oxygen atom forms two single sigma bonds with Hydrogen atoms. -1 c. #2 Next, indicate lone pairs on the atoms. (3) Distribute the remaining electrons throughout the molecule, keeping in mind the duet and octet. H2O. ^ These offers are provided at no cost to subscribers of Chegg Study and Chegg Study Pack. 1 Answer. Let us determine the Lewis structures of SiH 4, CHO 2 −, NO +, and OF 2 as examples in following this procedure: Determine the total number of valence (outer shell) electrons in the molecule or ion. However, in reality hydrogen atom is rather prone to migration and the second structure is not favorable. The bond angles of HCN is 180 degrees. , How many dots are there in the Lewis symbol for a nitrogen atom, N?, Which of the ionic compounds below would be expected to have the. There are three lone pairs on each fluorine atom. WARNING! Long answer. Bond distances are measured in Ångstroms (1 Å = 10 –10 m) or picometers (1 pm = 10 –12 m, 100 pm = 1 Å). Unlock. A step-by-step explanation of how to draw the H3CCN Lewis Dot Structure. Put two electrons between atoms to form a chemical bond. Indicate the Lewis acid and Lewis base (LA or LB) and whether they are also Bronsted acids and bases (BA or BB) for each. Lewis structure of nitric acid. The molecular geometry of any molecule depends on its Lewis structure, the arrangement of atoms, and its electrons. . CH4 molecular geometry is tetrahedral and its electron geometry is also tetrahedral. . Note that you should put the CH3O- Lewis structure in brackets with as 1- on the outs. 5°. The Lewis structure is a diagram that illustrates the arrangement of atoms, bonding electrons, and l. NO3– has a trigonal planar structure with bond angle 1200. 10. Also, all the 24 valence electrons of C3H6O (as calculated in step #1) are used in the above structure.