The electronic configuration of atoms A,...

The electronic configuration of atoms A, B, C are given below
A =`1s^2 2s^2 2p^6 3s^1`
B = `1s^2 2s^2 2p^6 3s^2 3p^5`
C = `1 s^2 2s^2 2p^6 3s^2 3p^6 4s^1` Name the elements

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