Which one of the following elemental forms is not present in the enamel of the teeth?

Question

Canvas Classes · Accepted Answer

Tooth enamel is primarily composed of hydroxyapatite  and fluorapatite .

Components present:
-  ✓ (calcium ions)
-  ✓ (phosphorus in phosphate , oxidation state = +5)
-  ✓ (fluoride ions in fluorapatite)

is NOT present in tooth enamel. Phosphorus in enamel exists as  where P is in +5 state, not +3.

Answer: Option (2) —

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