DP Chemistry (last assessment 2024)

Question 17N.3.hl.TZ0.21a

[Maximum mark: 2]

17N.3.hl.TZ0.21a

Lutetium-177 is used in radiotherapy. It emits beta radiation when it decays.

(a)

State a nuclear equation to show the decay of lutetium-177.

[2]

Markscheme

${}_{71}^{177}{\text{Lu}} \to {}_{71}^{177}{\text{Hf}} + {}_{ - 1}^0{\text{e}}$ «+ $\nu$ »

correct A and Z AND beta product

Accept “β/ β^–/e/e^–” for “ ${}_{-1}^{~0}{\text{e}}$ ”.

Accept “¹⁷⁷Lu → ¹⁷⁷Hf + e^– «+ $\nu$ »”.

Syllabus sections