Răspuns:
A; 1s2/2s2,2p6/3s2,3p6/4s1,3d5; per4,grVI sec(b).bloc d Z=24 Cr
B;1s2/2s2,2p6/3s2,3p6/4s2,3d8;per4,grVIIIsec(b) ,blocd, Z=28 Ni
C;1s2/2s2,2p63s2,3p1; per3,grIII princ(a) bloc p, Z=13 Al
D;1s2/2s2,2p6/3s2,3p6/4s2,3d10,4p6 per4, gr VIII princ( A),Z=36 Kr
Explicație: