Question

Valency of an element X is 3. Write the chemical formula of its Oxide.​

Answer 1

X2O3
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Thank you

Answer 2

The valency of the Element X is 3
So,
There are in all 3 atoms in its valence shell.

Element X wants to lose 3 electrons to attain the electronic configuration of the nearest noble gas.

Thus, it's valency will be 3+

Now ,

Oxygen has atomic number =8

The electronic configuration of Oxygen will be as follows :-

2,6

Now ,

The nearest noble gas is neon with electronic configuration :-
2,8

So,

Oxygen will require 2 more electrons to attain the noble gas configuration.

Thus,
It will gain 2 electrons.

Thus, valency of Oxygen will be 2-


When,

X and Oxygen will react it will form the oxide of Element X.

The chemical formula will be as follows :

$x_2o_3$


Thanks!