define the term atomic number/mass number
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- Atomic number: The number of unit positive charge carried by the nucleus of an atom is called atomic number.
- Mass number: The sum of neutrons and protons is known as mass number.
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atomic number :total number of protons present in the neucles of an atom is called A. N
MASS NUMBER:the total number of protons and neutrons present in the neucles of atom
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