Question

Which of the following pairs are isobars?

• A. ${}_{17}C{l}^{35}\&{}_{17}C{l}^{37}$
  
• B. ${}_{18}A{r}^{40}\&{}_{18}C{a}^{40}$
  
• C. $6C^{12}\&6C^{14}$
  
• D.
  None of these

Answer 1

The correct option is B ${}_{18}A{r}^{40}\&{}_{18}C{a}^{40}$

Isobars are the atoms of different elements having the same atomic mass but different atomic numbers. ${}_{18}A{r}^{40}\&{}_{18}C{a}^{40}$ represents isobars.