Question

Give reasons
isotopes of an element are chemically similar
noble gases show least reactivity

Answer 1

(a) Isotopes of an element have same atomic number and electron. So they will have similar electronic configuration and distribution. Since the chemical properties of elements are related to their electronic configuration i.e., the elements with similar configuration will have similar properties. Thus, the isotopes of an element are chemically similar.

(b) The atoms of noble gas elements have complete outermost shells and they cannot form bonds with other elements. Hence, they are least reactive.