[--Dr.Mostafa--]

Mg 12

Ne 10 3s2
-

P 15

Ne 10 3s2 3p3
-

Fe 26

Ar18 3d6 4s2
-

Sc 21

Ar 18 3d1 4s2
-

Sn 50

Kr36 4d10 5s2 5p2
-

I 53

Kr36 4d10 5s2 5p5
-

Ag 47

Kr36 4d10 5s1
-

Au 79

Xe54 4f14 5d10 6s1
-

As 33

Ar18 3d10 4s2 4p3
-

Cs 55

Xe 54 6s1
-