Multiple Choice
How many valence electrons are in a nitrogen (N) atom?
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- 1. The Chemical World10m
10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
An atom has the electron configuration 1s2 2s2 2p3. How many valence electrons does this atom have?
A
7
B
3
C
5
D
2
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Verified step by step guidance1
Identify the electron configuration given: 1s2 2s2 2p3.
Recall that valence electrons are the electrons in the outermost shell (highest principal quantum number, n).
Determine the highest principal quantum number in the configuration, which is n = 2 (from 2s2 and 2p3).
Count the electrons in the orbitals with n = 2: 2 electrons in 2s and 3 electrons in 2p, totaling 5 electrons.
Conclude that the atom has 5 valence electrons because these are the electrons available for bonding in the outermost shell.
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