Chemistry · May / June 2019 · Paper 12 · Question 27
5070Atomic structure and the Periodic Table
Which property is common to $^{40}$Ca, $^{39}$K and $^{23}$Na?
- ATheir atoms all have more neutrons than protons.
- BTheir ions all have eight electrons in their outer shell.
- CThey all sink when added to water.
- DThey are all deposited at the positive electrode when their molten chloride is electrolysed.
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Correct answer: B. Their ions all have eight electrons in their outer shell.
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