Răspuns:
Mg-----> Z=12 ; K-2e, L-8e M-2e [pe stratul M se afla e de valenta]
Explicație:
4,8kg=4800g Mg
n=4800g : 24g/moli=200moli Mg
1 mol Mg----------6,023.10²³atomi Mg-----------2 . 6,023.10²³ e de valenta
200moli------------------x------------------------------------------y
x=200 . 6,023.10²³=1204,6.10²³atomi Mg
y=200 . 2 . 6,023.10²³=2409,2 .10²³ e de valenta
0,5 kmoli=500moli Mg
1mol Mg---------6,023.10²³atomi Mg-----------2 . 6,023.10²³ e de valenta
500moli Mg-----------x-------------------------------------------y
x=500.6,023.10²³atomi Mg =3011,5.10²³
y=500 . 2 . 6,023.10²³ e de valenta =6023 .10²³ e de valenta
verifica calculele !
