Which one of the following elemental forms is | vedclass

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(B) The enamel of human teeth is primarily composed of hydroxyapatite,which is a crystalline form of calcium phosphate,$Ca_{10}(PO_4)_6(OH)_2$. In thi

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$P^{3+}$

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(B) The enamel of human teeth is primarily composed of hydroxyapatite,which is a crystalline form of calcium phosphate,$Ca_{10}(PO_4)_6(OH)_2$. In this structure,calcium exists in the $Ca^{2+}$ oxidation state. Phosphorus exists in the phosphate ion $(PO_4)^{3-}$,where the oxidation state of phosphorus is $+5$ $(P^{5+})$. Fluoride ions $(F^{-})$ are also often incorporated into the enamel structure to form fluorapatite,which strengthens the teeth. Therefore,$P^{3+}$ is not present in the enamel of the teeth.

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

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