Multiple Choice
Nitrogen has atomic number 7. In its ground-state electronic structure, how many occupied electron shells (principal energy levels) does a nitrogen atom have?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Shells
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Which element contains a full second energy level (n = 2) in its ground-state electron configuration?
A
Sodium (Na)
B
Oxygen (O)
C
Neon (Ne)
D
Magnesium (Mg)
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