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| Description: Chemical elements are composed of units of matter of the same type called atoms Atoms are the smallest units of matter that retain the properties and characteristics of an element Atoms are composed of protons, neutrons, and electrons Picture Stats: Views: 207 Filesize: 277.69kB Height: 519 Width: 691 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40671 |