Question 73

The mass number of an isotope of an element is 298. If its nucleus has 188 neutrons, what is its atomic number?


Atomic number = Total protons present in the nucleus of an atom

Mass number = Total number of protons and neutrons in an atom

Given, mass number = 298 and total number of neutrons = 188 

Now, Atomic number = mass number - total neutrons

Atomic number = 298 - 188 = 110

Hence, option B is the correct answer.

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