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The atomic number of phosphorus (P) is 15.

The atomic weight of P is 30.973762 grams per mole.

See the Web Links to below this answer for a periodic table with more information about this element!

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11y ago
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13y ago

The atomic weight of a phosphorus atom is 30.9 u.

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11y ago

30.97 amu

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Q: What is the atomic weight of phosphorus?
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