A calcium atom (Ca) with Z-20 has the following electronic configurations: Ca: 1s2 2s2 2p6 3s2...

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Question

A calcium atom (Ca) with Z-20 has the following electronic configurations: Ca: 1s2 2s2 2p6 3s2 3p6 4s2 Ca*: 1s2 2s2 2p6 3s2 3

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