Q. An isobar of $\ _{20}Ca^{40}$ is
A) $\ _{18}Ar^{40}$
B) $\ _{20}Ca^{38}$
C) $\ _{20}Ca^{42}$
D) $\ _{18}Ar^{38}$
Explanation
(a)
Isobars have same atomic mass but different atomic number.
Thus, the isobar of _{20}Ca^{40} is _{18}Ar^{40}.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.