Which of the following are the characteristics of isotopes of an element? (i) Isotopes of an element have same atomic masses (ii) Isotopes of an element have same atomic number (iii) Isotopes of an element show same physical properties (iv) Isotopes of an element show same chemical properties (a) (i), (iii) and (iv) (b) (ii), (iii) and (iv) (c) (ii) and (iii) (ii) and (iv)