Question

distribuição eletrônica para os elementos com o numero atomicos 20 30 40 e 23

Answer 1

20:  $1s^{2} 2s ^{2} 2p ^{6} 3s ^{2} 3p ^{6} 4s ^{2}$

30: $1s ^{2} 2s ^{2} 2p ^{6} 3s ^{2} 3p ^{6} 4s ^{2} 3d ^{10}$

40: $1s ^{2} 2s ^{2} 2p ^{6} 3s ^{2} 3p ^{6} 4s ^{2} 3d ^{10} 4p ^{6} 5s ^{2} 4d ^{2}$

23: $1s ^{2} 2s ^{2} 2p ^{6} 3s ^{2} 3p ^{6} 4s ^{2} 3d ^{3}$