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2015-12-13T23:16:21+08:00

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It is very easy to find the atomic mass or mass number of an element. You will just have to get your periodic table and check the element with atomic number of 15. You will see the that the Phosphorus with symbol of P is the element with atomic number 15. You have to check also the upper right side of the symbol P the name atomic weight or atomic mass and you will see that it has 30.9738 amu.
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