Question

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A metal (M) forms an oxide having the formula M2O3.It belongs to third period. Write the atomic number and valency of the metal.


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Answer 1

Answer:

since the element belongs to third period it means it has three shells.

and since the valency of oxygen is 2 means the valency of the atom will be 3.

therefore its electronic configuration will be 2,8,3

its atomic number will be 13

and the element is Aluminium

hope it helps you...

Answer 2

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