Multiple Choice
In which electron shell are the valence electrons of gallium (Ga) located?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many total valence electrons are present in a molecule of CO_2?
A
16
B
18
C
8
D
12
Verified step by step guidance1
Identify the valence electrons for each atom in the molecule. Carbon (C) is in group 14 and has 4 valence electrons, while oxygen (O) is in group 16 and has 6 valence electrons each.
Determine the number of atoms of each element in the molecule. In CO_2, there is 1 carbon atom and 2 oxygen atoms.
Calculate the total valence electrons contributed by each element by multiplying the number of atoms by their valence electrons: for carbon, multiply 1 by 4; for oxygen, multiply 2 by 6.
Add the valence electrons from all atoms together to find the total number of valence electrons in the CO_2 molecule using the formula: $\text{Total valence electrons} = (1 \times 4) + (2 \times 6)$.
Use this total to help in drawing the Lewis structure or understanding the bonding in CO_2.
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