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Atomic Number and Mass Number

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  • Definition: Atomic Number
  • Definition: Mass Number
CISCE: Class 10

Definition: Atomic Number

The atomic number of an element is equal to the number of protons in the nucleus.

 Atomic number (Z) = Number of protons.
                                 = Number of electrons. 

CISCE: Class 10

Definition: Mass Number

The mass number of an element is the sum of the number of protons and neutrons in the nucleus of the atom of that element.

Mass number (A) = No. of protons (p)
                             + No. of neutrons (n)

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