Question

Which of the following are isotopes

(i) Atom, Whose nucleus contains $20 p+15 n$

(ii) Atom, whose nucleus contains $20 p+17 n$

(iii) Atom, whose nucleus contains $18 \mathrm{p}+22 \mathrm{n}$

(iv) Atom, whose nucleus contains $18 p+21 n$

(A) (i) and (iii)

(B) (i) and (w)

(C) (ii) and (ii)

(D) (iii) and (iv)

Answer 1

The correct option of this question is (D) (iii) and (iv)

Hint : Isotopes have same atomic number but different mass number.