Răspuns:
C carbon
Z=6, A=12
6p ,6e, 6n
1s2 2s2 2p2
M C =12g/mol
n= 3/12=0,25 moli C
1moli C---------6 .6,023×10²³ e‐
0,25 moli-----------x e‐
x=0,25 ×6 ×6,023×10²³ e =9,0345×10²³ e‐
