Chemistry · Oct / Nov 2025 · Paper 11 · Question 5
Metals lose electrons when they combine with a non-metal to form an ionic compound. Calcium combines with hydrogen to form the ionic compound calcium hydride, CaH$_2$. How many electrons are there in the outer shell of each of the two hydride ions in CaH$_2$?
- A0
- B1
- C2
- D4
As printed in the paper
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Correct answer: C. 2
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