They are all incredibly electronegative, meaning that they are very willing to take electrons from other atoms. 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. Properties and uses of the halogens. 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. This can be explained by the fact that they all have one valence electron, thus they "want" to get rid of it. These hydrides have strong reducing properties. The stability of the hydrides thus formed, reduces with the increase in the atomic numbers of alkali metals. The alkali metals have the silver-like lustre, high ductility, and excellent conductivity of electricity and heat generally associated with metals. Reactivity of alkali metals and halogens Alkali metals, particularly sodium, are important in commercial use and chemical synthesis. Terms in this set (5) Alkali Metals 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. 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. The term ‘halogen’ means 'salt former'. 3. Except lithium iodide, all other halides are ionic in nature. Shows both the reactions and properties of some chemical elements. Alkali metals react with elements of the halogen group (Group 17 of the periodic table) to form halides. 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. Examples of alkali metals: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), ceasium (Cs), and francium (Fr). Group 7 elements form salts when they react with metals. Furthermore, an alkali metal's valence electron is relatively far away from the nucleus, making it … They are pretty much opposites. The alkali metals are on the far left side of the periodic table, thus they have the lowest ionization energy. Alkali Metals: •are placed in group 1, • can be cut with a knife. They have one outermost shell electron. Explanation: Alkali metals are the metals found in group 1 of the periodic table. Halogens: •are placed in group 17, • react vigorously with metals. 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