Question

An isobar of ${}_{20}C{a}^{40}$ is

• A. ${}_{18}A{r}^{40}$
• B. ${}_{20}C{r}^{38}$
• C. ${}_{20}C{a}^{42}$
• D. ${}_{18}A{r}^{38}$

Answer 1

Answer: (A)

Isobars have same atomic mass but different atomic number. Thus, the isobar of ${}_{20}C{a}^{40}$ is $18A{r}^{40}$