Question

Isobars are atoms with the same

• A. atomic number
• B. mass number
• C. number of electrons
• D. number of protons
• E. number of neutrons

Hint:

Isobars are particularly important in nuclear physics and radioactive decay processes, often having different stability and decay paths.

Answer 1

The Correct Option is B

Step 1: Isobars are atoms (not necessarily of the same element) that have the same mass number but different atomic numbers. 
Step 2: The mass number is defined as the total number of protons and neutrons in an atom's nucleus. 
Step 3: Isobars have the same total number of nucleons (protons plus neutrons), which results in the same mass number. 
Step 4: Therefore, the defining characteristic of isobars is that they share the same mass number, aligning with option (B).