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Most elements exist in the form of isotopes: these are atoms all have the same number of electrons and protons but the number of neutrons varies from one isotope to another. As a result, each isotope of an element has a different Atomic Mass. The atomic mass given for an element is an average of these atomic masses, weighted together according to the isotope's abundance on earth. That is why they have decimal points and fractional parts.

They d not look at all scary! After all, what can numbers do to you? You are much bigger than them!

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8y ago

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