Question

Isobars have:

• A. same mass number but different atomic number
• B. same number of neutrons but different mass number
• C. same difference between number of protons and neutrons
• D. same mass number and atomic number

Answer 1

The correct option is A same mass number but different atomic number

Isobars have different atomic numbers because they have different numbers of protons. They have the same atomic mass because they have just enough neutrons to make the same total of nucleons.