8. Complete the following sentences, filling in the blanks with suitable words and numbers.
$CaS$ is a compound called ___ . It is formed by the chemical combination of and _ . It represents one _ of the compound. Each molecule of this solid contains one atom of _ combined with one __ of sulphur.

Calcium, sulfide, calcium, sulfur

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molecule, calcium, atom

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Solution

A compound is defined as a pure substance that is made up of two or more elements in a fixed ratio by mass.
A molecule is the smallest part of an element or a compound that can exist independently.
$CaS$ is a compound called Calcium sulphide. It is formed by the chemical combination of calcium $(Ca)$ and sulphur $(S)$ . It represents one molecule of the compound. Each molecule of this solid contains one atom of calcium combined with one atom of sulphur.

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