Every physical ____ in the world is made up of atoms and combinations of atoms within the ____. Elements are materials that contain only one type of ____. Compounds are made up of atoms of more than one different ____. The periodic table contains all the elements that ____. The name of an ____ of an element can be abbreviated. This abbreviation is always a ____ letter or a capital letter plus one ____ letter, for example, a hydrogen atom is called ____ (a capital letter) and a copper atom is called ____ (a capital letter plus one lowercase letter).

Unit 1: Gap Fill Exercise

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