dau coronița
va rog
![Dau Coronița Va Rog class=](https://ro-static.z-dn.net/files/d3b/a783941df1660b3ff8010bc866329492.jpg)
Răspuns:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1
Z=55 Cs
5 orbitali p
stratul 5 complet ocupat.