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