Multiple Choice
Which of the following is the number of valence electrons in a hydrogen atom?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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When drawing the Lewis structure for ozone (O3), why do we multiply the number of valence electrons of oxygen by 3?
A
Because the octet rule requires each oxygen atom to have three times the usual number of valence electrons.
B
Because oxygen shares its valence electrons equally among three molecules in ozone.
C
Because oxygen forms three bonds in ozone, requiring three times its valence electrons.
D
Because ozone contains three oxygen atoms, and each oxygen atom contributes its own valence electrons.
Verified step by step guidance1
Identify the number of oxygen atoms in the ozone (O3) molecule, which is 3.
Recall that each oxygen atom has 6 valence electrons because oxygen is in group 16 of the periodic table.
To find the total number of valence electrons available for bonding in ozone, multiply the number of oxygen atoms by the valence electrons per oxygen atom: $3 \times 6$.
Understand that this total represents all the valence electrons contributed by the three oxygen atoms combined, which are used to form bonds and lone pairs in the Lewis structure.
Recognize that this multiplication is necessary because each atom contributes its own valence electrons, not because of the octet rule, bonding patterns, or electron sharing among molecules.
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