Răspuns:
Z=10---> 1atom are 10e si 10 p
A=20=p+n---> n= 10--> 1 atom are 10 n
1mol atomi.................10xN,A e=10xN,An N,A-nr. lui Avogadro
5000mol......................x
x= 50000x6.023x10²³ e=50000x6,023x10²³n
N=30,115x10²⁷e=30,115x10²⁷n
Explicație:
