An atom is small particle of molecule which parts in reaction directly. It contains electron, proton and neutron.it is structural and functional unit of a matter.as for example that any atom contain 20 proton is Calcium Ca. A human hair is equal to about a million carbon atom across.
characters of atom :
1. No create or destroy of atom
2. unique of element
3. basic part of element
4. having proton, electron and neutron around the nucleus.
5. It can be negative or positive.
6. Molecule is built with consist of atoms.
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