They are pretty much opposites. They have one outermost shell electron. Properties and uses of the halogens. Halogens: •are placed in group 17, • react vigorously with metals. This can be explained by the fact that they all have one valence electron, thus they "want" to get rid of it. Alkali metals, particularly sodium, are important in commercial use and chemical synthesis. Properties of Alkali Metals. Alkali Metals: •are placed in group 1, • can be cut with a knife. Although Hydrogen, is a member of group sometimes exhibit the properties of alkali metals. Reactivity of alkali metals and halogens Except lithium iodide, all other halides are ionic in nature. 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. Examples of alkali metals: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), ceasium (Cs), and francium (Fr). Halogens are the compounds found in group 17 of the periodic table. 3. Examples of halogens are Fluorine (F), Chlorine (Cl), Bromine (Br) and Iodine (I). The stability of the hydrides thus formed, reduces with the increase in the atomic numbers of alkali metals. Lithium is the lightest metallic element. They are all incredibly electronegative, meaning that they are very willing to take electrons from other atoms. These hydrides have strong reducing properties. 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. The alkali metals are on the far left side of the periodic table, thus they have the lowest ionization energy. Reaction with Halogens. Explanation: Alkali metals are the metals found in group 1 of the periodic table. Terms in this set (5) Alkali Metals Alkali metals have been studied since 1807, when Sir Humphry Davy explored the electrical properties of potassium and sodium. The term ‘halogen’ means 'salt former'. Shows both the reactions and properties of some chemical elements. Furthermore, an alkali metal's valence electron is relatively far away from the nucleus, making it … 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. Group 7 elements form salts when they react with metals. 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. Hydrogen shares some properties of alkali metals and halogen, yet it is neither. The alkali metals have the silver-like lustre, high ductility, and excellent conductivity of electricity and heat generally associated with metals. Alkali metals react with elements of the halogen group (Group 17 of the periodic table) to form halides. 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