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How many valence electrons does a neutral beryllium (Be) atom 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
5
B
7
C
2
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, 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), which are the \$2s^2\( and \)2p^3$ electrons, totaling 5 valence electrons.
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