Calculate the atomic number of an element whose mass number is 31 and number of neutrons is 13. What is the symbol of the element?
Calculate the atomic number of an element whose mass number is 31 and number of neutrons is 13. What is the symbol of the element?
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We know that, mass number = Number of protons + Number of neutrons
But number of protons is equal to the atomic number.
∴ Mass number = Atomic number + number of neutron
or Atomic number = Mass number - number of neutron = 31 - 16 = 15
The element with atomic number 15 is phosphorus which has symbol P.
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