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How many valence electrons does argon (Ar) have?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
How many valence electrons does a nitrogen (N) atom have?
A
3
B
2
C
7
D
5
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검증된 단계별 안내1
Identify the element in question, which is nitrogen (N).
Determine the atomic number of nitrogen, which is 7, meaning it has 7 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Write the electron configuration of nitrogen: \$1s^2 2s^2 2p^3$.
Count the electrons in the outermost shell (the second shell here), which are \$2s^2\( and \)2p^3$, totaling 5 valence electrons.
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