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Aflati configuratia electronica:
Z=55;
Z=82;
Z=99.


Răspuns :

Z=55

1s2 2s22p6 3s23p6 4s23d104p6 5s24d105p6 6s1

Z=82

1s2 2s22p6 3s23p6 4s23d104p6 5s24d105p6 6s24f145d106p2

Z=99

1s2 2s22p6 3s23p6 4s23d104p6 5s24d105p6 6s24f145d106p6 7s26f11

Z=55

K(1)= 2e-; L(2)=8e-; M(3)=8e-; N(4)=18e-; O(5)=18e- ; P(6)=1e-

Z=82

K(1)=2e-; L=8; M=8; N=18; O=18; P=30

Z=99

K=2; L=8; M=8; N=18; O=18; P=32; Q=13