Question

What are examples of compounds and non-compounds?

Answer 1

Hint: An atom is the smallest unit of matter which forms a chemical element. Matter is anything which occupies space and has definite mass. Matter exists in three states which are known as states of matter; these are known as solid, liquid and gas.

Complete answer:
Every atom is composed of a nucleus and this nucleus is made up of protons and neutrons where protons are positively charged and neutrons are neutral in charge and electrons which are positively charged are revolving around the nucleus.
When different elements undergo different chemical reactions then atoms are rearranged into new compounds which hold together with the help of chemical bonds.
Hence a compound is a molecule which is made up of atoms from different elements. All compounds are known as molecules but not all molecules are compounds. The main property of compounds is that the relative proportions of the elements in a compound are fixed and the components of a compound do not retain their individual properties. Large amount of energy is needed to separate the components of a compound.
The main example of compound is water represented by the chemical formula ${{H}_{2}}O$ which indicates 2 atoms of hydrogen combines with 1 atom of oxygen, sodium chloride etc and non-compounds are those which does not combine with two elements like bromine molecule represented by $B{{r}_{2}}$.

Note:
In chemistry an element can be defined as the pure substances which consist of atoms which have the same number of protons in their atomic nucleus. Where protons are positively charged in nature. Elements are those which cannot be broken down into further components.