a) Mg, Z = 12 => 1s²/2s²2p⁶/3s²
b) grupa a II-a A, perioada 2, este al 12-lea in S.P
c) Mg -2e⁻ ⇒ Mg²⁺
d) valenta II
e) cedeaza 2e⁻ => caracter metalic, caracter chimic electropozitiv
f) MgCO3
raport atomic => Mg:C:O = 1:1:3
raport de masa => Mg:C:O = 24:12:48 = 12:6:24 = 6:3:12 = 2:1:4
MMgCO3 = AMg+AC+3AO = 24+12+3*16 = 84g/mol
%Mg = mMg/M*100 = 24/84*100 = Calculeaza !!
%C = 12/84*100 = Calculeaza !!
%O = 48/84*100 =
