Respuesta:
12: 1s2,2s2,2p6,3s2
20: 1s2,2s2,2p6.3s2,3p6,4s2
36: 1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6
19: 1s2,2s2,2p6.3s2,3p6,4s1
54: 1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s2,4d10,5p6
Explicación:
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Respuesta:
12: 1s2,2s2,2p6,3s2
20: 1s2,2s2,2p6.3s2,3p6,4s2
36: 1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6
19: 1s2,2s2,2p6.3s2,3p6,4s1
54: 1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s2,4d10,5p6
Explicación: