The reaction of VIIA group elements.VIIA group elements is called the halogens (halogen) is 5 element is fluorine (F), chlorine (Cl) bromine (Br).Iodine (I) and astatine (At).The important properties of VIIA group elements are as follows.1. Elemental diatomic molecule (diatomic molecule) all the elements.2. At room temperature element among this is 3 status and toxicity.- F2 gas light yellow color.- Cl2 gas light green with pungent smell nose cold.- Br2 liquid is dark brown with high pressure of volatile.- At2 solid and radioactive elements.3. Not the heat, no conductivity and water insoluble because of covalent molecules without polarity.4 have low melting and boiling points.5. An element with the EN highest among the same.Reactions of group elements, explain from the following experimentA solution of transition effects observed in the class.Cl2 / CCl4 (colorless) Br2 / CCl4 (Orange) L2 / CCl4 (magenta).KCl.KBr.KI colorless.Orange.Magenta, orange.Orange.Magenta, magenta,Magenta,Magenta,The experimental results showed thatWhen the concentration Cl2 / CCl4 into a solution KBr has orange I CCl4 showed Br2 happened in I CCl4 when เติมสาร melt Cl2 / CCl4. Solution Br2 / CCl4 into a solution KI and purplish pink in the 2 CCl4 tube is L4 occurs.CCl4 equations show reaction can be written as follows.2Br-+Cl2 2Cl-+Br2.2I-+Cl2 2Cl-+I2.2I - + Br4 2 2Br-+I2.Experimental results show that the color in the unchanged reaction is not2Cl - + Cl2.2Cl - + Br2.2Br - + Br2.2Cl - + I2.2Br - + I2.2I - + I2.Concluded that the elements on group. Can react with the ions of elements below all. Or said element on can oxidize (electron) ion of the elements below all.The strength of the discontentment; F2 > > > Cl2 Br2 I2.
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