Ncert Exercises & Solutions

Identify the pairs which are not of isotopes.

a. $_{6}^{12}X \ , \ _{6}^{13}Y$
b. $_{17}^{35}X \ , \ _{17}^{37}Y$
c. $_{6}^{14}X \ , \ _{7}^{14}Y$
d. $_{4}^{8}X \ , \ _{5}^{8}Y$

1. a, d
2. b, c
3. c, d
4. b, d

(c, d)

(a)

{}_{6}^{12}X and {}_{6}^{13}Y

have same atomic number but different mass number.

(b) ${}_{17}^{35}X and {}_{17}^{37}Y$ have same atomic number but different mass number. Both these pairs are isotopes to each other.

(c) ${}_{6}^{14}X and {}_{7}^{14}Y$ have different atomic number but same mass number.

(d) ${}_{4}^{8}X and {}_{5}^{8}Y$ have different atomic number but same mass number.

Both these pairs are isobars to each other.

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