. Two atoms are said to be isobars if
1. They have same atomic number but different mass number
2. They have same number of protons but different number of neutrons
3. They have same number of neutrons but different number of protons and electrons
4. Sum of number of protons and neutrons are same but number of protons is different
Sol: Isobars: Isobars have the same atomic mass or mass number but different atomic number Atomic mass/ mass number = No. of protons + No. of neutrons.
Atomic No. = No. of protons