Reaction with Halogens. Lithium is the lightest metallic element. The interhalogens react like their component halides; halogen fluorides, for example, are stronger oxidizing agents than are halogen chlorides. The alkali metals have low melting points, ranging from a high of 179 °C (354 °F) for lithium to a low of 28.5 °C (83.3 °F) for cesium. The term ‘halogen’ means 'salt former'. Alkali metals belong to the s-block elements occupying the leftmost side of the periodic table.Alkali metals readily lose electrons, making them count among the most reactive elements on earth. Properties and uses of the halogens. Although Hydrogen, is a member of group sometimes exhibit the properties of alkali metals. 3. Alkali metals, particularly sodium, are important in commercial use and chemical synthesis. They have one outermost shell electron. Furthermore, an alkali metal's valence electron is relatively far away from the nucleus, making it … The alkali metals have the silver-like lustre, high ductility, and excellent conductivity of electricity and heat generally associated with metals. Halogens are the compounds found in group 17 of the periodic table. Explanation: Alkali metals are the metals found in group 1 of the periodic table. Reactivity of alkali metals and halogens Group 7 elements form salts when they react with metals. Hydrogen shares some properties of alkali metals and halogen, yet it is neither. Alkali metals have been studied since 1807, when Sir Humphry Davy explored the electrical properties of potassium and sodium. This can be explained by the fact that they all have one valence electron, thus they "want" to get rid of it. In this article, we will explain the electronic configurations, ionization enthalpy, hydration enthalpy and atomic, ionic radii and other physical and chemical properties of the group one alkali metals. Halogens: •are placed in group 17, • react vigorously with metals. They are pretty much opposites. They are all incredibly electronegative, meaning that they are very willing to take electrons from other atoms. These hydrides have strong reducing properties. Alkali Metals: •are placed in group 1, • can be cut with a knife. Alkali metals react with elements of the halogen group (Group 17 of the periodic table) to form halides. Use the periodic table to identify and explain the properties of chemical families, includong alkali metals, alkaline earth metals, halogens, noble gases, and transition metals. Shows both the reactions and properties of some chemical elements. Examples of alkali metals: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), ceasium (Cs), and francium (Fr). 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