Difference between atomic number and mass number.

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Solution

Atomic Number Mass Number
It is defined as the total number of protons present in the atom of an element.
It is defined as the sum of Total number of protons and neutrons present in the atom of an element.
It is denoted by the letter 'Z'.
It is denoted by the letter ‘A’.
It has no units
Atomic mass or mass number is mostly measured using atomic mass unit (amu).
Two elements can not have the same atomic number.
Two elements can have the same atomic mass or the mass number.

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Atomic Number	Mass Number
It is defined as the total number of protons present in the atom of an element.	It is defined as the sum of Total number of protons and neutrons present in the atom of an element.
It is denoted by the letter 'Z'.	It is denoted by the letter ‘A’.
It has no units	Atomic mass or mass number is mostly measured using atomic mass unit (amu).
Two elements can not have the same atomic number.	Two elements can have the same atomic mass or the mass number.