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Phosphorus (P) - 15, Sodium (S) - 16, Chlorine (Cl) - 17, Argon (Ar) - 18 and Potassium (K) - 19.

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What is the difference between average atomic mass and atomic mass?

Average atomic mass is the weighted average mass of all the isotopes of an element, taking into account their natural abundances. Atomic mass refers to the mass of a single atom of a specific isotope of an element.


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