Question

about atoms and molecules

Answer 1

some earliest time people tell that automatic smallest particle of matter and they are individual and they said to be John Dalton but this is incorrect period Amar smallest particle of matter and they have content she is about me particle

Answer 2

ATOM - The smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons. 
MOLECULE-The smallest particle of a specificelement or compound that retains the chemicalproperties of that element or compound; two or more atoms held together by chemical bonds.