Question

e urgent
dau coronița ​

Answer 1

Răspuns:

1s²

2s² 2p⁶

3s² 3p⁶ 3d¹⁰

4s² 4p⁶

5s¹

2+2+6+2+6+10+2+6+1= 37 e => Nr atomic (Z)= 37 (Rb)

b. rsp la a.. 37 electroni