Q1. 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. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is false. Both A and R are false.
Answer. Correct Answer is (1.) Both A and R are true and R is the correct explanation of A. All isotopes have same atomic number, which means they have the same number of electrons. So, they bear similar chemical properties.
