Molecules and Ions - diatomic molecules. These include H,...

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Molecules and Ions Although atoms are the smallest unique unit of a particular element, in nature only the noble gases can be found as isolated atoms. Most matter is in the form of ions , or compounds . Molecules and chemical formulas A molecule is comprised of two or more chemically bonded atoms. The atoms may be of the same type of element, or they may be different. Many elements are found in nature in molecular form - two or more atoms (of the same type of element) are bonded together. Oxygen, for example, is most commonly found in its molecular form " O 2 " (two oxygen atoms chemically bonded together). Oxygen can also exist in another molecular form where three atoms are chemically bonded. O 3 is also known as ozone. Although O 2 and O 3 are both compounds of oxygen, they are quite different in their chemical and physical properties. There are seven elements which commonly occur as
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Unformatted text preview: diatomic molecules. These include H, N, O, F, Cl, Br, I. An example of a commonly occurring compound that is composed of two different types of atoms is pure water, or "H 2 O". The chemical formula for water illustrates the method of describing such compounds in atomic terms: there are two atoms of hydrogen and one atom of oxygen ( the "1" subscript is omitted ) in the compound known as "water". There is another compound of Hydrogen and Oxygen with the chemical formula H 2 O 2 , also known as hydrogen peroxide. Again, although both compounds are composed of the same types of atoms, they are chemically quite different: hydrogen peroxide is quite reactive and has been used as a rocket fuel (it powered Evil Kenievel part way over the Snake River canyon). Most molecular compounds (i.e. involving chemical bonds) contain only non-metallic elements ....
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

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