Răspuns :
7s+6p=235
2s+3p=80
2s+3p=80/•2
4s+6p=160
7s+6p=235|-
4s+6p=160|
3s=75
s=25
50+3p=80
3p=30
p=10
2s+3p=80
2s+3p=80/•2
4s+6p=160
7s+6p=235|-
4s+6p=160|
3s=75
s=25
50+3p=80
3p=30
p=10