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8 December, 18:28

Why is the atomic mass of many elements not a whole number? a. elements are unstable. b. an element may have isotopes with different numbers of neutrons. c. the atomic mass includes all the electrons. d. isotopes are always expressed in decimals.

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  1. 8 December, 21:44
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    B, an element may have isotopes with different number of neutrons.

    So if you many isotopes with different mass numbers (protons+neutrons), when you take the average of all of them., most likely, it won't be a whole number
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