Question

Identify the pairs which are not of isotopes?

(i) ¹²₆X, ¹³₆Y

(ii) ³⁵₁₇X, ³⁷₁₇Y

(iii) ¹⁴₆X, ¹⁴₇Y

(iv) ⁸₄X, ⁸₅Y

Answer 1

(iii) ¹⁴₆X, ¹⁴₇Y

(iv) ⁸₄X, ⁸₅Y

Explanation:

The isotopes are defined as atoms with identical atomic numbers but different mass numbers are known as isotopes.