An atom has 12 protons, 12 electrons and 12 neutrons. Its mass number is _ and atomic number is __.

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Solution

Atomic number: Atomic number of an element is equal to the number of protons present in the nucleus of atom of that element.
As number of protons = 12 (Given)
Therefore, Atomic number = 12
Mass number: Mass number of an element is equal to the number of nucleons (protons and neutrons) present in the atom.
Mass number = Number of protons+ Number of neutrons
Number of neutrons = 12 (Given)
Number of protons = 12 (Given)
On substitution, Mass number = 12 +12
Therefore, Mass number = 24
An atom has 12 protons, 12 electrons and 12 neutrons. Its mass number is 24 and atomic number is 12.

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An atom has 12 protons, 12 electrons and 12 neutrons. Its mass number is _______ and atomic number is ________.

An atom has 12 protons, 12 electrons and 12 neutrons. Its mass number is _ and atomic number is __.