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Why are only valence electrons, and not core electrons, typically involved in chemical bonding?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons are in a nitrogen (N) atom?
A
3
B
7
C
8
D
5
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Identify the atomic number of nitrogen (N), which is 7. This means nitrogen has 7 electrons in total.
Recall that valence electrons are the electrons in the outermost shell (energy level) of an atom.
Determine the electron configuration of nitrogen: \$1s^2 2s^2 2p^3$.
Recognize that the first shell (1s) is the inner shell and the second shell (2s and 2p) is the outermost shell for nitrogen.
Count the electrons in the outermost shell: \$2s^2$ has 2 electrons and \$2p^3$ has 3 electrons, so total valence electrons = 2 + 3 = 5.
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