Different kinds of atoms of the same element are called isotopes having different _ but same _ properties.

Explanation

Different kinds of atoms of the same element, which have the same number of protons but different numbers of neutrons (resulting in different masses), are called isotopes. Isotopes of the same element have different physical properties, such as different atomic masses and, in some cases, different nuclear stabilities. However, isotopes of the same element have the same chemical properties. This is because chemical properties are primarily determined by the number and arrangement of electrons, which is determined by the number of protons in the nucleus. Since isotopes of the same element have the same number of protons, they exhibit the same chemical behavior.