Q4 of 75 Page 57

What is the role of valency in the combination of atoms?

Role of valency:

i. The combining power of an element is known as its valency.


ii. Valency can be used to find out how the atoms of an element will combine with the atoms of another element to form a compound.


More from this chapter

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2

Predict the total number of atoms in each case.

(i) Calcium phosphate


(ii) Hydrogen sulphide


(iii) Magnesium bromide


(iv) Sodium oxide


(v) Aluminium hydroxide

 3

Give symbol and valency of the following ions.

Hydroxide ion, carbonate ion.

 5

An element X forms X2(CO3)3 type compound. What is the formula of its phosphate and chloride?

 6

Write the formula of the following compounds.

(i) Magnesium sulphate


(ii) Sodium bromide


(iii) Calcium chloride


(iv) Potassium nitrate


(v) Sodium phosphate