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Legal. alkali metalAny of the soft, light, reactive metals of Group 1 of the periodic table; lithium, sodium, potassium, rubidium, cesium, and francium. The answer is: Hydrogen differs from alkali metals as it does not possess metallic character.. Access detailed answers to various other Science and Maths questions at BYJU'S. From the top to the bottom of group 1, the elements have heavier, more reactive atoms. Metal hydroxides are chemical compounds containing a metal cation and –OH anion. The same pattern holds for sodium and potassium. They are very soft metals, which become liquid just above room temperature. Even an atom with a very complex electron composition such as cesium still has the single s electron in its outer orbital (see Figure 1). They are relatively soft and low in density. Hydrogen and alkali metals of group 1 [IA] react with copper [II] oxide to give copper. One value of the periodic table is the ability to make predictions about the behavior of individual elements.  By knowing which group an element is in, we can determine the number of reactive electrons and say something about how that element will behave. The Periodic Table: Alkali Metals Quiz now play this via selecting your answer on Is hydrogen an alkali metal?. Rubidium and cesium react yet more vigorously and explode on contact with water. Alkali Metals Lithium is stored in oil because of its high reactivity. All alkali metals form oxides, which are basic in nature. These are the electrons in the outer energy level of the atoms that can be involved in chemical reactions. You probably think of water as a substance that can put out fires. CK-12 Foundation – Joy Sheng. As a result, they are found in nature only in combination with other elements. Hydrogen is a very reactive gas, and the alkali metals are even more reactive. But some elements are so reactive that they burn in water. 6. A mixture of hydrogen and chlorine can be separated by passage through a porous pot. Alkali metals are all solids at room temperature. 4. Hydrogen is considered to be in a group of its own. Why don’t we know much about francium (atomic number 87)? The reactivity of alkali metals increases from the top to the bottom of the group, so lithium \(\left( \ce{Li} \right)\) is the least reactive alkali metal and francium \(\left( \ce{Fr} \right)\) is the most reactive. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. Use the data in the group 1 table to fill in the blanks below with either increases or decreases. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Elements in the same group of the periodic table have the same number of valence electrons. Hydrogen burns in oxygen to form its oxide. 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