Question

As the given number of neutrons in the nucleus of a given atom of an element increases, the atomic number of that element

Answer 1

c. remains the same
The atomic number will only increase if there is an increase in protons.
The average atomic mass (or amu) will increase if the number of neutrons increase.
 If an element's mass is greater or less than the average atomic mass, it is known as an isotope.

Answer 2

Since the atomic number of an element consists of neutrons and also electrons, we can conclude that since the number of neutrons are increasing, the atomic number will also increase. That is called an isotope (when the number of neutrons differ)

Final answer:- b. Increases