Elements and Compounds. 1  Element-An element is a substance composed of the same type of atoms (e.g. gold Au, oxygen O 2). 2  Compound-A compound is a substance made of more than one type of atom (e.g. water H 2 O, carbon dioxide CO 2).
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United Kingdom. The United Kingdom of Great Britain and Northern Ireland, simply called the United Kingdom or UK, is a sovereign state inNorthern Europe. It is a constitutional monarchy that is made up of four separate countries. It is a member of the European Union, United Nations, the Commonwealth, NATO and the G8.