How we can find the atomic number and mass number of an element? (like calcium).

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Solution

The mass number of an isotope is the sum of the number of protons and neutrons in the atomic nucleus. The atomic number is the number of protons.

The calcium-40isotope has a mass number of 40 , and an atomic number of 20 .

Calcium has 20 protons and 20 neutrons.
So atomic number of Calcium
=No of protons=20
Mass number of Calcium=
No of protons+No of neutrons
=20+20=40

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