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O-LevelChemistryBonding & Structure5070/11 · Oct/Nov 2025 · Q51 Mark

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, CaH2. How many electrons are there in the outer shell of each of the two hydride ions in CaH2?

A0
B1
C2
D4

✓ Correct answer

C: 2

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About this question

Topic
Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, Oct/Nov 2025 Paper 1 Variant 1, question 5.

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