Question

Question 17

Identify the pairs which are not of isotopes ?

(a) ${}_6^{12}\text{X}{,}_6^{12}\text{Y}$ (b) ${}_{17}^{35}\text{X}{,}_{17}^{37}\text{Y}$ (c) ${}_6^{14}\text{X}{,}_7^{14}\text{Y}$ (d) ${}_4^8\text{X}{,}_5^8\text{Y}$

Answer 1

(a) ${}_6^{12}\text{X},and{}_6^{12}\text{Y}$ have same atomic number but different mass number.

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

(c) ${}_6^{14}\text{X}and{}_7^{14}\text{Y}$ have different atomic number but same mass number

(d) ${}_4^8\text{X}and{}_5^8\text{Y}$ have different atomic number but same mass number. Both these pairs are isobars to each other.