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 Atom:  the smallest possible piece of an element.

 Element: a substance in which all of the atoms are (almost) identical

 Molecule: a combination of two or more atoms connected in a fixed ratio that act as a single

unit.

 Compound: a molecule containing two or more elements.

Issue 2 – September 2016           1-8                                   Total Training Support Ltd
                          Module 2.1 Matter                                         © Copyright 2016
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