객관식
How many valence electrons does calcium (Ca) have?
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Valence Electrons of Elements
객관식
How many valence electrons are present in a neutral atom of nitrogen?
A
5
B
2
C
7
D
3
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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. This means a neutral nitrogen atom has 7 electrons.
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$.
Count the electrons in the outermost shell (the second shell): \$2s^2$ and \$2p^3$ add up to 5 valence electrons.
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