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Question

From the symbol 31P15, state:
(i) mass number of phosphorous,
(ii) atomic number of phosphorous, and
(iii) electron configuration of phosphorus.

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Solution

(i) The mass number is always represented in superscript.
So, the mass number of phosphorous = 31

(ii) The atomic number is always represented by subscript
So, the atomic number of phosphorous = 15

(iii) Electronic configuration of phosphorous = 2, 8, 5

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