Question

${}_{90}{K}^{40}$ and $20C{a}^{40}$ are known as :

• A. isotopes
• B. isobars
• C. inslones
• D. isodiaphers

Answer 1

Answer: (B)

${}_{19}{K}^{40}$ and ${}_{20}C{a}^{40}$ are isobars they have same mass number but different atomic number.