Q.

What are isobars?

A. Elements with same atomic number but different mass number
B. Elements with different atomic number but same mass number
C. Elements with different atomic number and different mass number
D. Elements with same atomic number and same mass number
Answer» B. Elements with different atomic number but same mass number
Explanation: Isobars are atoms of different chemical elements that have the same number of n cleons. Correspondingly, isobars differ in atomic number (number of protons) but have the same mass number.
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