Question

Which of the following are isotones?

• A. ${}_{18}A{r}^{40}$
• B. ${}_{20}C{a}^{42}$
• C. ${}_{21}S{c}^{43}$
• D. ${}_{21}S{c}^{41}$

Answer 1

Answer: (A), (B), (C)

Isotones:Elements that contain same number of neutrons