can the electronic configuration of ca be 1s2 2s2 2p6 3s2 3p6 4s1 3d1, when excited why not or why is it so?

Dear Student,

Electronic configuration of Ca in ground state is 1s​2 2s2 2p6 3s2 3p6 4s2
Now, the orbital next to 4s is 3d, so in the excited state, one electron from 4s will jump to 3d. 
Hence, electronic configuration of excited Ca atom is ​1s​2 2s2 2p6 3s2 3p6 4s1 3d1

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