1.

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

Answer»

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

From the formula M2O3 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.



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