An atom having atomic mass number 13 has 7
Question:

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?

Solution:

The mass number of an atom = number of protons + number of neutrons

Therefore atomic number ( number of protons ) = mass number – no. Of neutrons.

The atomic number of atom: 13 – 7 = 6.

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