Question

Isotopes have similar chemical properties but different physical properties.why?

Answer 1

Isotopes of an element have same number of electrons,electrons determine the chemical property of an element,so they have same chemical properties or same atomic number but they have different number of neutrons so their mass number is different and they have different physical properties

Answer 2

isotopes are having same number of electrons and thus there chemical properties are same because the chemical properties of elements depending on the number of electrons present in the atom..
whereas numbers of neutrons are different this the physical properties are different....