AP Chemistryeasymcq1 pt
What is the maximum number of electrons that can occupy the n = 3 shell?
A.18
B.8
C.10
D.6
Explanation
Core Concept
Shell capacity follows 2n². At n = 3 the shell holds one 3s orbital (2 electrons), three 3p orbitals (6 electrons), and five 3d orbitals (10 electrons), for 18 in total. Counting orbitals first and doubling catches every subshell.
Correct Answer
A18
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