Q:

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

A:

Quick Answer

To find the number of neutrons in an atom, subtract the number of protons in the atom from the atom's mass. These numbers are found on the periodic table of elements.

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Full Answer

  1. Get a periodic table of elements

    Periodic tables are found online and in chemistry textbooks. They list every known element and provide the number of protons and atomic masses for each element.

  2. Find the element's atomic number

    The atomic number is located above the element symbols. This is the number of protons found in one atom of the element.

  3. Find the element's atomic mass

    The atomic mass is listed beneath the element symbols. This is the sum of the protons and neutrons found in one atom of the element. It is an average of all possible isotopes, so, round the value to the nearest whole number to find the most common mass.

  4. Find the number of neutrons in one atom

    Subtract the atomic number from the atomic mass. The difference is the number of neutrons found in one atom of the element.

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