Question

An .......... is a substance that cannot be broken down into simpler substances by chemical means.

Answer 1

Elements

An element is usually defined as the simplest form of a pure substance with definite physical and chemical properties and which can neither be broken into nor built from simpler substances by any chemical or physical method.

An element contains only one kind of particles. These particles may be atoms or molecules.

For example: carbon, sulphur, iron, gold, hydrogen, oxygen, nitrogen, silver etc.

Elements are the fundamental materials of which all matter is composed.