Chemistry · May / June 2019 · Paper 12 · Question 5
5070Atomic structure and the Periodic Table
Two particles, K$^+$ and Ar, can be written as $^{39}_{19}$K$^+$ and $^{40}_{18}$Ar. Which statement about these particles is correct?
- AAr has more neutrons than K$^+$.
- BK has more nucleons than Ar.
- CK$^+$ has 20 electrons.
- DK$^+$ has a greater mass than Ar.
As printed in the paper
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Correct answer: A. Ar has more neutrons than K$^+$.
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