Multiple Choice
How many valence electrons does a neutral germanium (Ge) atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons are present in the nitrate ion, NO_3^-?
A
24
B
28
C
32
D
30
Verified step by step guidance1
Identify the atoms present in the nitrate ion (NO_3^-): one nitrogen (N) atom and three oxygen (O) atoms.
Determine the number of valence electrons for each atom: nitrogen has 5 valence electrons, and each oxygen has 6 valence electrons.
Calculate the total valence electrons from the atoms by multiplying the number of atoms by their valence electrons: total from nitrogen is $5 \times 1 = 5$, and total from oxygen is $6 \times 3 = 18$.
Add the extra electron due to the negative charge of the ion (since the ion has a charge of -1, it has one additional electron).
Sum all valence electrons: $5 + 18 + 1$ to find the total number of valence electrons in the nitrate ion.
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