Question

Which of the following pairs is an isobar?

• A. ${}_1{H}^1$ and ${}_1{H}^2$
• B. ${}_1{H}^2$ and ${}_1{H}^3$
• C. ${}_6{C}^{12}$ and ${}_6{C}^{13}$
• D. ${}_{15}{P}^{30}$ and ${}_{14}S{i}^{30}$

Answer 1

Answer: (D)

Isobars are the elements which have same mass number. So, ${}_{15}{P}^{30}$ and ${}_{14}S{i}^{30}$ are isobars.