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Element
A simple and pure form of matter that cannot be decomposed into smaller substances.
Atom
The smallest particle of an element which may or may not exist independently but can take part in a chemical reaction.
Compound
A substance formed by chemical combination of two or more elements in a fixed proportion by mass.
Symbol
A short form that stands for one atom of an element
Significance of symbol
It represents:
Name of Element
One atom of element
Definite mass of the element
Valency
Number of electrons that an atom can lose, gain or share during a chemical reaction.