What is the mass number and atomic number of the 31/15 phosphorus
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Answer:atomic numbers for phosphorus is 15 and its mass number is 31 bcz it is the sum of mass and atomic number
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Isotopes are named of their mass numbers and known for element that has 15 protons . it increases atomic number by taking 15 electrons and 16 neutrons used for mass numeric and minus atomic number. this isotopes is phosphorus 31 and atomic number is 15 only. potassium has mass number of 39 and atomic range is 19.
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