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All elements are composed of atoms. The atom is the smallest unit of an element and the contains the subatomic particles protons, neutrons, and electrons. The image below shows the atomic structure of elements commonly found in biological macromolecules.

Mary-Pat Stein. Created for Albert.io. Copyright 2016. All rights reserved.

All atoms have an atomic number which is equal to the number of
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in that atoms' nucleus. In contrast, the total mass of an atom is dependent on the total number of
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. In the image provided of atoms commonly found in biological macromolecules, the atom that would have an atomic mass of 14 is shown in panel
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while the atom with an atomic number of 11 is displayed in panel
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.
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