APFIVE Ground-State Electron Configuration
Which of the following represents the ground-state electron configuration for a neutral atom of calcium?
A
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
B
1s² 2s² 2p⁶ 3s² 3p⁶ 4p²
C
1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
D
1s² 2s² 2p⁶ 3s² 3p⁶ 3d²
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