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White phosphorus exists as:

1. \( P \) molecule
2. \( P_{2} \) molecule
3. \( P_{6} \) molecule
4. \( P_{4} \) molecule

Correct answer: \( P_{4} \) molecule

Solution

White phosphorus is made of discrete tetrahedral P4 molecules, not single atoms or larger simple molecules like P2 or P6. This structure is characteristic of its allotrope and explains its high reactivity.

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