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Atoms are the smallest part if chemical element that can ever exist. different atoms have different masses. For example, all oxygen atoms have 8 protons and all sodium atoms have 11 protons. The mass number of an atom is the total number of protons and neutrons it contains.
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An atom is the smallest particles of an element,which takes part in a chemical reaction and maintain it's chemical identity throughout all physical and chemical reactions.
The mass of an atom is the sum of the masses of protons(1.67262×10-²4 g) and neutron(9.10939×10-²6g)
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