Define atomic no and mass no.
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Atomic number is the total number of protons present in the nucleus of atom. It is equals to the total number of electrons present outside the nucleus of an atom. It is represented by symbol A.
Mass number is the sum of the protons and neutrons present in the nucleus of an atom.
It is represented by symbol Z.
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The number of protons determines an element's atomic number and is used to distinguish one element from another. ... Together, the number of protons and the number of neutrons determine an element's mass number.
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