Răspuns:
A,Li=7g/mol
niu= m/M=14/7mol=2mol
1mol...................................N,A=6,022x10²³atomi
2mol...............................x= 12,044x10²³atomi
1atm........................3e.............3p.....(7-3)n
12,044x10²²at.........x...............y.............y
x=y=36,132x10²³e=36,132x10²³p
z=48,176x10²³ n
Explicație: