How do you determine the number of neutrons in an atom?

How you can determine the number of neutrons an atom has from an atom's mass number and its atomic number?

  • Answer:

    Mass Number = Number of protons and neutrons (nucleons) Atomic Number = Number of protons Mass Number - Atomic Number = Number of neutrons The Periodic Table shows the atomic mass number: Average mass number of all isotopes (varying numbers of neutrons) of an element.

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# of neutrons = atomic mass- atomic number

Greg G

The number of neutrons = mass no. - atomic no. However, the mass number given in the periodic table is not an integer because of the isotopes of the element. Each isotope will have a different no. of neutrons. If dealing with a single atom (a single isotope), the above formula is correct.

gp4rts

As far as i can remember protons= atomic number so in the mass number= protons + neutron. therefore mass number-atomic number = neutrons Please dont qoute me on that.

ViRgO

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