Question

what is atom and molecules​

Answer 1

Explanation:

When two or more atoms link up, they create a molecule . A molecule of water is made of two atoms of hydrogen (H) and one atom of oxygen (O). The molecular mass is the sum of the masses of all the atoms in the molecule. A collection of molecules is called a compound.

Answer 2

Answer:

Atom

the smallest particle that exhibits all the properties of matter and does not have an independent existence is called an atom

Molecule

The smallest particle of matter that exhibits all the properties of matter and has an independent existence is called a molecule