객관식
How many electrons are present in the outermost energy level (valence shell) of a neutral potassium (K) atom?
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Valence Electrons of Elements
객관식
How many valence electrons does an atom of nitrogen have?
A
2
B
5
C
7
D
3
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검증된 단계별 안내1
Identify the element in question, which is nitrogen (N).
Recall that the number of valence electrons corresponds to the electrons in the outermost shell of an atom.
Determine the electron configuration of nitrogen: \$1s^2 2s^2 2p^3$.
Focus on the electrons in the second shell (the outermost shell for nitrogen), which includes the \$2s$ and \$2p$ orbitals.
Count the electrons in the \$2s$ and \$2p$ orbitals: \(2 + 3 = 5\) valence electrons.
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