Chemistry - Atomic Structure Question with Solution | TestHub

Question Explanation: Identifying a non-isobaric pair

Concept: Isobars and atomic properties

Solution: Isobars are atoms of different elements that have the same mass number ($A$) but different atomic numbers ($Z$). Use the decay chain to determine the mass numbers for each element and identify the pair that is not an isobar.

$${}_Z^M\mathrm{A}\stackrel{\alpha }{\to }{}_{Z-2}^{M-4}\mathrm{B}\stackrel{\alpha }{\to }{}_{Z-4}^{M-8}\mathrm{C}\stackrel{\beta }{\to }{}_{Z-3}^{M-8}\mathrm{D}\stackrel{\beta }{\to }{}_{Z-2}^{M-8}\mathrm{E}\stackrel{\alpha }{\to }{}_{Z-4}^{M-12}\mathrm{F}\stackrel{\beta }{\to }{}_{Z-3}^{M-12}\mathrm{G}\stackrel{\alpha }{\to }{}_{Z-5}^{M-16}\mathrm{H}$$

C and G are not isobars. Isobars have the same mass number but different atomic numbers.

Final Answer: C and G