Sketch, on paper, the Lewis structure of HCl, remembering to: Step 1: Arrange the atoms Step 2: Count the number of valence electrons. Step 3: Allocate two electrons between each pair of atoms which are assumed to be covalently bound. Step 4: Use the remaining valence electrons to form lone pairs, and/or double and triple bonds. What is the total number of valence electrons in HCl? 8 How many electrons are shared between hydrogen and chlorine? 2 How many lone pairs are there on the chlorine atom? 3 多重下拉选择题

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Following the rule that each atom of carbon, oxygen and nitrogen bonds in such a way as to achieve a complete outer shell of eight valence electrons, the number of unshared pairs of electrons (lone pairs) in this molecule will be A. 7 B. 6 C. 5 D. 8

Sketch, on paper, the Lewis structure of CO, remembering to: Step 1: Arrange the atoms Step 2: Count the number of valence electrons. Step 3: Allocate two electrons between each pair of atoms which are assumed to be covalently bound. Step 4: Use the remaining valence electrons to form lone pairs, and/or double and triple bonds. What is the total number of valence electrons in CO? [ Select ] 16 10 14 8 How many electrons are shared between carbon and oxygen? [ Select ] 4 3 6 2 How many lone pairs are there on the oxygen atom? 1

Sketch, on paper, the Lewis structure of H2, remembering to: Step 1: Arrange the atoms Step 2: Count the number of valence electrons. Step 3: Allocate two electrons between each pair of atoms which are assumed to be covalently bound. Step 4: Use the remaining valence electrons to form lone pairs, and/or double and triple bonds. What is the total number of valence electrons in H2? 2 What type of bond exists between the two hydrogen atoms? [ Select ] Triple Single Double How many lone pairs are there on each hydrogen atom? [ Select ] 2 0 3 1

Sketch, on paper, the Lewis structure of O2, remembering to: Step 1: Arrange the atoms Step 2: Count the number of valence electrons. Step 3: Allocate two electrons between each pair of atoms which are assumed to be covalently bound. Step 4: Use the remaining valence electrons to form lone pairs, and/or double and triple bonds. What is the total number of valence electrons in O2? 12 What type of bond exists between the two oxygen atoms? Double How many lone pairs are there on each oxygen atom? 2

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