Multiple Choice
How many valence electrons does a sulfur (S) atom have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does a nitrogen atom have?
A
7
B
3
C
2
D
5
Verified step by step guidance1
Identify the atomic number of nitrogen, which is 7. This means a nitrogen atom has 7 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom that participate in chemical bonding.
Determine the electron configuration of nitrogen: $1s^2 2s^2 2p^3$.
Recognize that the first shell (1s) is the inner shell and the second shell (2s and 2p) is the outermost shell for nitrogen.
Count the electrons in the outermost shell: $2$ electrons in the $2s$ subshell plus $3$ electrons in the $2p$ subshell, totaling $5$ valence electrons.
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