The atom of an element has 20 protons, 20 electrons and 20 neutrons.
What is the atomic number of the element?

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Solution

Atomic number(Z)- The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
Since the atom has 20 protons, its atomic number will be 20.
Calcium(Ca) is an element having the atomic number 20.
Hence, the answer will be 20.

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