Chemistry (Year 12)
Electron configuration
What is the electron configuration of a calcium atom?
1s² 2s² 2p⁶ 3s²
1s² 2s² 2p⁶ 3s² 3p⁶
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
1s² 2s² 2p⁶ 3s² 3p⁶ 3d²
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