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Section 5.2 The Modern Periodic Table
Section 5.2 The Modern Periodic Table

... a. Nonmetals are poor conductors of heat and electric current. b. Many nonmetals are gases at room temperature. c. Some nonmetals are extremely reactive and others hardly react at all. d. Nonmetals that are solids tend to be malleable. ...
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... There are a few things we must be aware of in the above equation. First, chlorine is an element that forms an anion, so it can only replace an element that forms an anion, in this case bromine. Second, chlorine and bromine are both diatomic molecules and must be written with a subscript of 2 when th ...
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Halogen

The halogens or halogen elements (/ˈhælɵdʒɨn/) are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The artificially created element 117 (ununseptium) may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17.The name 'halogen' means 'salt-producing'. When halogens react with metals they produce a wide range of salts, including calcium fluoride, sodium chloride (common salt), silver bromide and potassium iodide. The group of halogens is the only periodic table group that contains elements in three of the four main states of matter at standard temperature and pressure. All of the halogens form acids when bonded to hydrogen. Most halogens are typically produced from minerals or salts. The middle halogens, that is chlorine, bromine and iodine, are often used as disinfectants. Organobromides are the most important class of flame retardants. Elemental halogens are generally toxic.
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