Two or more atoms joined together chemically in a fixed proportion by mass are called molecules.

law of constant proportion

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law of conservation of mass

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Solution

The correct option is A
law of constant proportion

A molecule is a group of two or more atoms joined together chemically in a fixed proportion by mass.

E.g.: $H_{2}$ , $O_{2}$ , $C H_{4}$ , etc.

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Similar questions

The substance that is composed of two or more elements chemically combined with one another in a fixed proportion of mass is called ___ .

Law of constant proportion states that:

In a chemical substance the elements are NOT present in a definite proportion by mass.

A substance that is composed of two or more elements, chemically combined with one another in a fixed proportion is called a ____.

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