Question

What is atom and molecules

Answer 1

ATOMS:
An atom is the smallest particles of an element. It maintains its identity in all physical changes and chemical changes. The size of an atom is extremely small.

MOLECULES: 
Molecules represent a group of two or more atoms which are chemically bonded together.  
                                        OR
A molecule is also defined as the smallest particle of the element or a compound which is capable of and independent existence and describe all the properties of that substance.

Answer 2

$\huge \bold \color{orange}A \color{red}n \color{green}s \color{blue}w \color {purple}e\color {pink}r$

What is Atom ?

An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.

What is molecule ?

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge.

$thank \: u \\ hope \: it \: helps$