question_answer 134)

  In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below: (a) A and R both are true and R is the correct explanation of A. (b) A and R both are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A and R both are false. Assertion (A): All isotopes of a given element show the same type of chemical behaviour. Reason (R): The chemical properties of an atom are controlled by the number of electrons in the atom.

Answer:

  (a) All isotopes of an element have same number of electrons and same electronic configuration; hence their chemical properties are also same.