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MCQ
The electronic configuration of calcium (Z = 20) is:
Unit-3 Atomic Structure
A 2, 8, 8, 2
B 2, 8, 10
C 2, 8, 9, 1
D 2, 8, 8, 1
Explanation

Calcium's 20 electrons fill as 2, 8, 8, 2 in the K, L, M and N shells.

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