Question

Comment on the physical and chemical properties of isotopes of an element.

Answer 1

They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element. The electron arrangement is the same owing to same chemical properties. However they have different numbers of neutrons, which affects the mass number. Mass number determines the physical properties such as boiling/melting/density etc.
The physical properties of isotopes of the same element are not identical because the atomic mass and mass number differ. This affects physical properties such as density and temperature of change of state, eg. boiling and melting point.