what is atom and what is sub atomic mass?
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Explanation:
atom is the smallest particle of the matter which cannot be exist in free state .
the sub atomic mass is the mass of charges electron, proton and neutron present in the atoms.
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An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.
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