X, Z=29 , A=64
=> 1s2 2s2 2p6 3s2 3p6 4s1 3d10
blocul d elemente
gr. 11 (I-B), per. 4
gaz rar X = 1s2 2s2 2p6 3s2 3p6 3d10 Cu⁺
1 mol X = 64 g
1 mol .......... 64 g Cu ......... 10x6,022x10la23 e- d
4 g .................. n = 3,764x10la23 e- d
elementul X Z=31
=> 1s1 2s2 2p6 3s1 3p6 4s2 3d10 4p1
nr straturi = 4
substarturi = 8
bloc de elemente = p
gr. 13 (III-A), perioada = 4
=> 1s1 2s2 2p6 3s1 3p6 4s2 3d10
gaz rar => 1s1 2s2 2p6 3s1 3p6 3d10
1-f
2-d
3-c
4-b
5-a
