Two nuclei have different number of protons and different number of neutrons. Can they have the same radii and same nuclear density?

Nuclei having same number of protons but different number of neutrons are known as

The nuclei having the same number of protons but different number of neutrons are called

Atoms whose nuclei contain different number of protons but same number of neutrons are called

Consider the following statements- I. Isotopes are atoms having same number of protons but different number of neutrons. II. Isotopes are atoms having same number of neutrons but different number of protons. III Isotopes are atoms having same number of protons and neutrons. Choose the correct statement.

Do isobars have the same number of neutrons?

The pair of atoms having the same number of neutrons is