Question

a metal m has a valancy +2, write the formula of Oxide ​

Answer 1

Answer:

Period no. = no. of shells , so n = 3

From the formula M

2

O

3

its valency is 3.

Since it is a metal, its valence shell has 3 electrons.

So its electronic configuration is 2,8,3

Atomic number = 13

Hence the metal is Aluminum with valency 3.

Answer 2

Answer:

berrilium oxide (Beo2)