Question

define element compound and molecules

Answer 1

Element - an element is defined as a pure substance which contains only one kind of atom .
example - silver ,copper etc.

compound - when two or more atoms of different elements combine the molecules of a compound is formed.
compound a pure substance and contain more than one kind of element .
example - NH3 , CO2

molecules - a molecule is defined as a smallest particles of an element or a compound which can exist freely .
example - H2 , N2 etc...