Răspuns:
1. Litiu, Li, 3, 7, 3, 4, 4
2. Sulf, S, 16, 32, 16, 16, 16
3. Siliciu, Si, 14, 28, 14, 14, 14
4. Potasiu, K, 19, 39, 19, 20, 20
5. Fosfor, P, 15, 31, 15, 16, 16
6. Cupru, Cu, 29, 64, 29, 35, 35
7.Calciu, Ca, 20, 40, 20, 20, 20
- Formulele pe care le am folosit:
Numarul atomic = Z
Numarul de masa = A
- neutroni= n⁰= A- Z
- protoni= p+= Z
- electroni= e‐= p+
