Q3 of 17 Page 24

The mass number of an atom is 31. The M shell of this atom contains 5 electrons.

What is the atomic number of this atom?

As the given atom is electrically neutral.

Hence, the number of protons = the number of electrons


∴ Number of protons = 15


Since, atomic number of an atom = the number of protons


∴ Atomic number of an atom = 15.


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