An element has mass number 31 and atomic number 15. The number of electrons, protons
and neutrons in it are respectively
(a) 15, 16, 15
(b) 16, 15, 15
(c) 15, 15, 16
(d) 31, 15, 15
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I don't understand this Question please tell me
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1 Answer. This is the isotope phosphorus-31. It has 15 protons, 15 electrons, and 16 neutroail.
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