# An Element B Shows Valencies of 4 and 6. Write the Formulae of Its Two Oxides. - Science

Short Note

An element B shows valencies of 4 and 6. Write the formulae of its two oxides.

#### Solution

Case i

Valency of B = 4

Valency of O = 2

Elements : B O

Valencies : 4 2

Formula for the oxide formed by the element B (valency 4) can be worked out by crossing over the valencies of the constituent elements.

Therefore, formula of the oxide of element B is B2O4. The formula has a common factor of 2; hence, dividing the formula by the common factor gives us the simplest chemical formula: BO2.

Case ii

Valency of element B = 6

Valency of O = 2

Formula for the oxide formed by the element B (valency 6) can be worked out by crossing over the valencies of the constituent elements.

Therefore, formula of the oxide of element B is B2O6. The formula has a common factor of 2; therefore, dividing the formula by the common factor gives us the simplest chemical formula: BO3.

Concept: Chemical Formula Or Molecular Formula
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#### APPEARS IN

Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 3 Atoms and Molecules
Short Answers | Q 16 | Page 151