It is very reactive and is widely used for many purposes, such as as a disinfectant. Chemistry of Chlorine (Z=17) Chlorine is a halogen in group 17 and period 3.It is a nonmetal, and is one of the few elements that can form diatomic molecules (F2). It is the most electronegative element, given that it is the top element in the Halogen Group, and therefore is very reactive. Its atomic number is 9 and its atomic weight is 19, and it's a gas at room temperature. Chemistry of Fluorine (Z=9) Fluorine (F) is the first element in the Halogen group (group 17) in the periodic table.Oxidizing Ability of the Group 17 Elements.Includes trends in atomic and physical properties, the redox properties of the halogens and their ions, the acidity of the hydrogen halides, and the tests for the halide ions. Group 17: Chemical Properties of the Halogens Covers the halogens in Group 17: fluorine (F), chlorine (Cl), bromine (Br) and iodine (I).Physical Properties of the Group 17 Elements.Group 17: General Properties of Halogens.Atomic and Physical Properties of Halogens.As a result, there is a regular increase in the ability to form high oxidation states. On the other hand, there is a regular decrease in the first ionization energy as we go down this group. This includes their melting points, boiling points, intensity of their color, the radius of the corresponding halide ion, and the density of the element. Group 17: Physical Properties of the Halogens It can be seen that there is a regular increase in many of the properties of the halogens proceeding down group 17 from fluorine to iodine.
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