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Mass number = no. of protons + neutrons Atomic number = no. of protons


Thus (mass number - atomic number) gives you no. of neutrons.


Therefore for phosphorus, the number of neutrons would be 16.

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15y ago

The Atomic Mass is the sum of neutrons and protons in the nucleus.

The atomic number of 15 means 15 protons, therefore the number of neutrons is 16

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Q: Phosphorus has an atomic mass of 31 and an atomic number of 15 the number of neutrons must be?
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Related questions

How many neutrons does phosphorus -33 have?

18. Phosphorus has an atomic number of 15, therefore it has 15 protons. Phosphorus-33 has a total of 33 protons and neutron and therefore has 18 neutrons. Phosphorus-33 is a synthetic unstable isotope of P.


What is the approximate atomic mass of a nuclide of phosphorus that an atomic number of 15 and that has 16 neutrons?

The atomic mass of phosphorous-31 is 30,97376163(20).


How many isotopes does phosphorus?

Have different atomic mass (have different numbers of neutrons)


If Phosphorous has an atomic mass of 30 and atomic number of 15 how many neutrons does it have?

Atomic mass is equal to the number of protons + neutrons present in the nuclide. The atomic number is defined as the number of protons in the nuclide. Therefore to find the number of neutrons use the formula: atomic mass = #protons + # neutrons solving for # of neutrons you get: # neutrons = atomic mass - # protons plug in the given values: #neutrons = 31 - 15 # neutrons = 16


Which isotope has 17 neutrons and an atomic mass of 32?

The number of protons is the atomic mass minus the number of neutrons; in this instance 32 - 17 or 15. An atomic number of 15 corresponds to the element phosphorus; therefore, the isotope is P-32.


How many protons electrons and nue trons does Phosphorus have?

The most stable isotope of phosphorus is phosphorus-31. The atomic number of phosphorus is 15, so it has 15 protons. In a neutral atom, there will also be 15 electrons. The number of neutrons is mass number minus atomic number, which is 31-15, so the number of neutrons is 16.


What is the number of neutrons in phosphorus-31?

the number of neutrons is mass


What does atomic mass do?

The atomic mass is equal to the number of protons plus neutrons. So if you know the atomic number then you can find out the number of neutrons Atomic # is the amount of Protons or Electrons Atomic Mass- Number of protons plus neutrons Atomic Mass-Atomic Number = Amount of neutrons


How many atoms are in phosphorus?

The number of protons and electrons are equal to the atomic number. For P, this is 15. The number of neutrons is the atomic mass minus the atomic number (31 - 15 = 16). So Phosporous has 15 electrons and protons, and 16 neutrons.


What does mass do?

The Atomic Mass is equal to the number of protons plus neutrons. So if you know the atomic number then you can find out the number of neutrons Atomic # is the amount of Protons or Electrons Atomic Mass- Number of protons plus neutrons Atomic Mass-Atomic Number = Amount of neutrons


How is the number of neutrons in an atom found?

The number of neutrons can be calculated if the atomic number and mass number of an element is known. The number of neutrons = Mass number - atomic number.


How many protons is in the nuclei of phosphorus?

Atomic StructureNumber of Energy Levels: 3First Energy Level: 2Second Energy Level: 8Third Energy Level: 5