Question

Which of the following are isobars?

• A. Ce, Se
• B. Fe, Se
• C. Fe, Ce
• D. Ce, Ni

Answer 1

The correct option is A Ce, Se

Atoms having the same atomic mass and different atomic numbers are known as isobars.

Ce and Se are isobars having the same atomic mass 76. They have different atomic numbers, i.e., Ce has an atomic number of 32 and Se has an atomic number of 34.

So, the correct option is $A$