![]() Sodium, potassium react with Oxygen and make relevant Oxide of metal. Liquid Li reacts (burning) with oxygen gas and make lithium oxide. Alkali metal hydrides with proton donors Reactions of air and alkali metals So they alkali metal hydrides react with water, alcohols,Īmmonia and alkyne to eliminate hydrogen gas. Therefore these hydrides behave as strong reducing agents. These ionic hydrides react with compounds Metal hydrides (H -) are given as products. ![]() (HCl, HNO 3, H 2SO 4) and emit hydrogen gas and produce relevant alkali metal salt.ĢK + H 2SO 4 = K 2SO 4 + H 2 Hydrogen and alkali metals reaction Solid sodium metal reacts with water to produce aqueous sodium hydroxide and hydrogen gas. Reaction of potassium with water is a highly flammable. These metal hydroxides are strong bases and Reactivity of potassium is higher than sodium.Īlkali metals react with water and emit hydrogen and relevant metal hydroxide are given.Reactivity of sodium is higher than lithium. ![]() So going down the group, reactivity increases. When atomic radius increases, elimination of last shell electrons gets more easier. To have very good reactivity for metals, ease of eliminating electrons should be high (electrons should be removed easily). When going down the group, atomic radius of metal increases. Potassium reacts vigorously with water and lithium slowly reacts. You can clearly see a difference of reactions. ![]() Observe the reaction of lithium, sodium and potassium reaction with water. Reactivity of alkali metals change down the group Most solids of alkali metal compounds take white colour. Commonly, we can show it asĪlkali metals are very reactive due to existence of only one electron in their last shell. Those elements have only one electron in their last shell. ![]()
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