Question

The valence number of metallic element x is 3 what is the formula of oxide?

Answer 1

Answer:

$Y_{2}$$O_{3}$

Explanation:

Let the metallic element be Y

ACCORDING TO THE QUESTION

Valency of metal Y is 3 and we know that valency of oxide is 2,

Therefore, the chemaical formula of metal oxide will be

$Y_{2}$$O_{3}$

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Answer 2

★ Answer:- ★

Valency of the metallic element (X) = +3

$\rm Formula: ({X}^{+3})$

(Similar elements - Aluminium, Silicon, etc.)

Valency of Oxide = -2 $\rm{ Formula: ({O}^{-2})}$

Therefore, we have to combine them and find their formula, i.e. of a radical and an element.

$\rm{ \therefore {X}^{+3} \searrow \swarrow {O}^{-2}}$

(The valencies are inter - changed and written near the foot.)

$\rm{ \longrightarrow \text{X}_{\text{2}} \text{O}_{\text{3}}}$ ...(Ans.)