Answer – A pure substance that cannot be broken down into simpler substances is called an element.

Explanation:

In chemistry, all matter (in solid, liquid, or gaseous state) is considered to be one of two types – a pure substance or a mixture. A substance that has the same composition and chemical properties throughout is called a pure substance; it can either be an element or a compound. 

Of these, a substance that cannot be broken down into simpler substances is an element. It is formed from only one type of atom and cannot be further divided into other newer substances when subjected to physical or chemical changes. Examples of elements include gold, copper, aluminum, nickel, and so on. Important information about all naturally occurring and synthetic elements can be obtained from the periodic table.

While an element cannot be split further into a different substance, an atom of one element can be combined with atoms of others to form a compound.

A compound is also a pure substance and is made of one kind of molecule, exhibiting the same physical properties all through. On employing chemical methods, it is possible for a compound to be broken down into its constituent elements. Some examples of compounds are water, sodium chloride (table salt), ethanol, and so on.

It’s useful to keep in mind that since both elements and compounds comprise the same type of matter throughout (atoms in elements and molecules in compounds), each of them has only one set of physical properties like melting point, boiling point, color, and so on.

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