Question

what is atom?????????​

Answer 1

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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. 

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Answer 2

REQUIRED ANSWER :

$\mapsto$ The smallest particle of an element, which may or may not have an independent existence but always takes place in a chemical reaction is called an atom. An atom is defined as the smallest unit that retains the properties of an element. An atom is composed of atoms and these cannot be made or destroyed.

$\rightsquigarrow$The size of an atom is extremely small, much smaller than our imagination. A layer of an atom as thick as a thin sheet of paper is formed when more than millions of atoms are stacked together

$\rightsquigarrow$Every atom has a nucleus that bounds one or more electrons around it.

$\rightsquigarrow$ The nucleus has typically a similar number of protons and neutrons which are together known as nucleons.

$\rightsquigarrow$TheDemocritus was a Greek philosopher who was discovered atom