capitolul 2

Question 1

cum se determina nr de masa(A)

Answer 1

A=Z+N, unde A-nr de masa, Z-nr neutroni, N-nr protoni si electroni

Question 2

ce este un atom stabil

Answer 2

are compozitie stabila, toti electronii umplu spinul, pot fi dubleti sau octeti

Question 3

atomi instabili

Answer 3

nu au spinuri complet implinite, nu sunt dubleti/octeti

Question 4

formula configuratiei electroniilor

Answer 4

1s^2; 2s^2, 2p^6; 3s^2, 3p^2,; 4s^2, 3d^10, 4p^6; 5s^2 4d^10, 5p^6; 6s^2, 4f^14,5d^10,6p^6; 7s^2, 5f^14 6d^10 ,7p^6