Question

Among ${}_{10}{A}^{20}{,}_{11}{B}^{21}{,}_{10}{C}^{22}$ and ${}_{11}{D}^{22}$, the isobaric combination is:

• A. ${}_{10}{A}^{20}$ and ${}_{10}{C}^{22}$
• B. ${}_{11}{B}^{21}$ and ${}_{10}{C}^{22}$
• C. ${}_{10}{C}^{22}$ and ${}_{11}{D}^{22}$
• D. ${}_{11}{B}^{21}$ and ${}_{11}{D}^{22}$

Answer 1

Answer: (C)

${}_{10}{C}^{22}$ and ${}_{11}{D}^{22}$

Isobars differ in atomic number (number of protons) but have the same mass number.

Here, element ${}_{10}{C}^{22}$ and ${}_{11}{D}^{22}$ have same ass number of 22.

Hence, option C is correct.