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