Răspuns:
a)Simbol chimic Si - siliciu
Z=14 A=28
14e, 14p, 14n
b) K=2e, L=8e, M=4e
1s2 2s2 2p6 3s2 3p2
c)
MSi=28g/mol
n=m/M=0,56/28=0,02moli Si
1mol Si........................14x6,023x10²³ electroni
0,02 moli S.....................x electroni
x=0,02 x14 x 6,023 x 10²³ electroni=1,68644 x10²³ electroni
Explicație:
