An element X forms the following compounds with hydrogen, carbon and oxygen :H₂X, CX₂, XO₂, XO₃State the three valencies of element X which are illustrated by these compounds.

Academic Chemistry NCERT Class 9

H₂X:

Element/Ion H X

Valency 1 2

To stabilize the compound with hydrogen, two atoms of X are required. Therefore, the valency of X in this compound is two.

CX₂:

Element/Ion C X

Valency 4 2

To stabilize the compound with carbon, two atoms of X are required. Therefore, the valency of X in this compound is two.

XO₂:

Element/Ion X O

Valency 4 −2

To stabilize this compound with oxygen, four atoms of X are required. Therefore, the valency of X in this compound is four.

XO₃:

Element/Ion X O

Valency 6 −2

To stabilize this compound with oxygen, six atoms of X are required. Therefore, the valency of X in this compound is six.

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Updated on: 10-Oct-2022

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