O-LevelChemistryBonding & Structure5070/11 · Oct/Nov 2017 · Q91 Mark

When a piece of sodium is heated in air, it reacts with oxygen to form the ionic compound sodium oxide, Na₂O. In terms of electrons, which statement correctly explains what happens when sodium reacts with oxygen?

AAn oxygen atom shares two electrons with two sodium atoms.

Bsodium atom loses two electrons which are transferred to an an oxygen atom.

Csodium atom shares its outer shell electron with two oxygen atoms.

DTwo sodium atoms each lose one electron which are both transferred to one oxygen atom.

✓ Correct answer

D: Two sodium atoms each lose one electron which are both transferred to one oxygen atom.

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2017 Paper 1 Variant 1, question 9.

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