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Which one of the following elemental forms is not present in the enamel of the teeth? (1) Ca2+ (2) P3+ (3) F- (4) P5+

1. Ca2+
2. P3+
3. F-
4. P5+

Correct answer: P3+

Solution

P3+ is not a stable or common oxidation state for phosphorus in biological systems, including tooth enamel, which primarily contains calcium (Ca2+), fluoride (F-), and phosphorus in the form of phosphate (P5+).

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