Multiple Choice
How many occupied electron shells does a neutral magnesium atom have in its ground-state electronic configuration?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Shells
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Nitrogen has atomic number 7. In its ground-state electronic structure, how many occupied electron shells (principal energy levels) does a nitrogen atom have?
A
1 shell
B
2 shells
C
7 shells
D
3 shells
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