Atom

In 1803, English chemist John Dalton (1766-1844) defined that substructure by introducing the idea that the material world is composed of tiny particles called atoms.
Atom is the smallest particle of an element, having all the properties of that element.It can take part in a chemical reaction. Symbol of an atom is same as the symbol of an element.Thus H stands for one atom of Hydrogen, N stands for one atom of Nitrogen

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