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Metal is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typically malleable (they can be hammered into thin sheets) or ductile (can be drawn into wires). A metal may be a chemical element such as iron; an alloy such as stainless steel; or a molecular compound such as polymeric sulfur nitride. In chemistry, a nonmetal is a chemical element that generally lacks a predominance of metallic properties; they range from colorless gases to shiny and refractory (high melting temperature) solids. Two nonmetals, hydrogen and helium, make up about 99% of ordinary matter in the observable universe by mass. Five nonmetallic elements, hydrogen, carbon, nitrogen, oxygen and silicon, largely make up the Earth's crust, atmosphere, oceans and biosphere.
There is no general agreement either on what geographic area constitutes Central Europe, nor on how to further subdivide it geographically. At times, the term "Central Europe" denotes a geographic definition as the Danube region in the heart of the continent, including the language and culture areas which are today included in the states of Croatia, the Czech Republic, Hungary, Poland, Romania, Serbia, Slovakia, Slovenia and usually also Austria and Germany, but never Russia and other countries of the former Soviet Union towards the Ural mountains. Depending on context, Central European countries are sometimes grouped as Eastern or Western European countries, collectively or individually but some place them in Eastern Europe instead for instance Austria can be referred to as Central European, as well as Eastern European or Western European and Slovenia can sometimes be placed in either Southeastern or Eastern Europe. The 15 countries comprising this subregion are Austria, Belgium, the Czech Republic, Denmark, France, Germany, Hungary, Ireland, Liechtenstein, Luxembourg, the Netherlands, Poland, Slovakia, Switzerland and the United Kingdom.