Dau coroana, URGENT
![Dau Coroana URGENT class=](https://ro-static.z-dn.net/files/d84/34b8d31e53132493eebdc1c0a1d92241.jpg)
Răspuns:
a) N2O3
N+³ O-²
b) CaCl2
Ca+² Cl-¹
c) Na2SO4
Na+¹ S+⁶ O-²
d) N2O5
N+⁵ O-²