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CBSE Class 10 Answered

A metal M forms an oxide having the formula M2O3. It belongs to third period in the mordern periodic table . Write the atomic number and valency of the metal.
Asked by pdcavita | 29 Nov, 2017, 10:26: PM
answered-by-expert Expert Answer
A metal M forms an oxide having the formula M2O3.
That is the valency of metal is 3. Elements with valency 3 belongs to group IIIA (13) of the periodic table.
So,metal M belongs to group IIA and 3rd period of periodic table.Tha t means metal M is Aluminium.
 
The atomic number of Aluminium = 13
Electronic configuration is (2,8,3)
Valncy of Aluminium = 3

Answered by Varsha | 30 Nov, 2017, 12:37: PM

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