50 D Explanation What Is The Number Of Neutrons In An Isotope With An Atomic Number Of 50?

What is the number of neutrons in an isotope with an atomic number of 50? - 50 d explanation

I'm studying for my exam at the School of Nursing, and is one of the questions to guide the study. Response options are:

Others likely to 50th
b. likely to exceed the 60th
c. probably less than 40 years.
d. unpredictable based on the atomic number.

The answer on the back of the book is told that "B" reads the statement as follows: "As the elements increases with the atomic number, which tends to increase the neutron proton."

Can someone please explain?