Question

A metal M forms an oxide having a formula M2O3.It belongs to third period of the modern periodic table.Write atomic number and valency of the metal.

Answer 1

An atomic number represents the number of protons in the nucleus and valency number of a metal is defined as the measure of the number of chemical bonds the atoms of a substance can form.

The atomic number of the periodic table for M2O3 is 13 and valency number of the compound is 3.

Hence the metal is aluminum in the periodic table 

Answer 2

Explanation:

the formula M2O3 indicates the valency of metal M is 3 .the M belomg to group 13and 3rd period . so the element. so Aluminium(Al) , the formula is Al2O3