Multiple Choice
Fluorine has atomic number 9. How many electron shells (principal energy levels) are occupied in a ground-state fluorine atom?
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9. Electrons in Atoms and the Periodic Table
Electronic Structure: Shells
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Which elements have two electron shells (i.e., electrons occupying only the and shells in their ground-state electron configurations)?
A
Elements in Period 3 (Na through Ar)
B
Elements in Period 1 (H through He)
C
Elements in Period 2 (Li through Ne)
D
All noble gases (He, Ne, Ar, Kr, Xe, Rn)
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