Answers

2016-02-10T22:10:41+05:30
The element with atomic number 12 is Magnesium.
(a) 1s²2s²2p⁶3s² is the electronic configuration of Mg.
(b) Mg is in IIA group .
(c) Mg is a metal.
(d) Magnesium chloride's formula is MgCl₂.
1 2 1
2016-02-10T22:12:29+05:30
the element is MAGNESIUM 
a. electronic configuration = 2,8,2

b. it belongs to group II A 
c. it is a metal
d. formula of magnesium chloride is MgCl₂  
i hope it helps...........
1 4 1