Question 73
The mass number of an isotope of an element is 298. If its nucleus has 188 neutrons, what is its atomic number?
Solution
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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