Multiple Choice
Which of the following elements has 8 valence electrons?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following represents the valence electron configuration for a nitrogen atom?
A
2s1 2p3
B
2s2 2p5
C
2s2 2p6
D
2s2 2p3
Verified step by step guidance1
Identify the atomic number of nitrogen, which is 7. This means a nitrogen atom has 7 electrons in total.
Recall that the electron configuration fills orbitals starting from the lowest energy level: 1s, then 2s, then 2p.
Write the full electron configuration for nitrogen: 1s2 2s2 2p3, where the first two electrons fill the 1s orbital, the next two fill the 2s orbital, and the remaining three occupy the 2p orbitals.
Focus on the valence electrons, which are the electrons in the outermost shell (n=2 for nitrogen). These are the electrons in the 2s and 2p orbitals.
Express the valence electron configuration by combining the electrons in the 2s and 2p orbitals: 2s2 2p3.
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