Question

Elements XYZhave atomic number 6 9 12 which one forms anion and forms cation

Answer 1

6=carbon 2,4=anion
9=Fluorine 2,7=anion
12=Magnesium 2,8,2=cation

Answer 2

H!! there!!

given atomic number 6 9 & 12

6 = Carbon
9 = Fluorine
12 = Magnesium

Anion : a negatively charged ion, i.e. one that would be attracted to the anode in electrolysis.

Cation : a positively charged ion, i.e. one that would be attracted to cathode in electrolysis.
Carbon Forms anion
Fluorine also Forms anion
& Magnesium Forms Catoin

hope it helps