Q. Mark the correct statement
A) Nuclei of different elements can have the same number of neutrons
B) Every element has only two stable isotopes
C) Only one isotope of each element is stable
D) All isotopes of every element are radioactive
Explanation
(a) Nuclei of different elements having the same mass number are called isotones $e.g.,\ \ \ _{4}Be^{9}$ and $\ _{5}B^{10}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.