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15= 1s2 ; 2s2 ; 2p6 ; 3s2 ; 3p3
25= 1s2 ; 2s2 ; 2p6 ; 3s2 ; 3p6 ;4s2 ; 3d5
28=1s2 ; 2s2 ; 2p6 ; 3s2 ; 3p6 ; 4s2 ; 3d8