Question

An atom ‘M’ of an element reacts with oxygen to form M2O3. The valency of the element ‘M’ is _____________ .​

Answer 1

Answer: the valency of the element is maybe 3 because it form oxide like aluminium which is Al2 o3

Explanation:

Answer 2

The valency of the element ‘M’ is 3.

Explanation:

Valency is defined as the number of electrons gained or lost in order to complete its octet. M needs to donate 3 electron, and thus the valency is 3.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here metal is having an oxidation state of +3 called as cation and anion is oxygen which forms $O^{2-}$ . Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $M_2O_3$

Learn more about ionic compounds

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