Your browser does not support the audio element. When moving down the periodic table, each alkali metal has an increasing atomic radius as well as increasing reactivity.The compound ammonium has very similar properties to the heavier alkali metals.They are considered to be more similar to each other than any other group in the periodic table.All alkali metals have odd atomic numbers.Different alkali metals burn with different colored flames including sodium (orange yellow), lithium (red), potassium (lilac), rubidium (red), and cesium (blue or violet).A standard reaction expressing the reactivity of metals with acids is given below-M + 2HCl MCl 2 + H 2. The name "alkali" is derived from the Arabic word for "ashes." The alkaline earth metals react quickly with acids, releasing dihydrogen.They are harder and have higher melting points and boiling points than the alkali metals. They like to form salts by combining with halogens. Group 2 elements are the alkaline earth metals, Be, Mg, Ca, Sr, Ba, Ra.Sometimes cesium is also spelled "caesium.".Sodium and potassium both play an important role in biological life on Earth.Cesium clocks are considered the most accurate of all clocks. Cesium and rubidium are used to make atomic clocks.Because they are so reactive with air and water, they are generally stored in oil.The most abundant of the alkali metals on Earth is sodium. They have a low density when compared to other metals.They are malleable, ductile, and good conductors of electricity and heat.Some of them will even explode when they come into contact with water. They react when coming into contact with water.They are not found in nature as a free element, but generally as salts. ![]() ![]() When exposed to air, they tarnish due to oxidation.They are soft enough to be cut with a knife.They all have one valence electron in the outermost shell which they seek to lose in order to have a full outer shell.What are the similar properties of alkali metals?Īlkali metals share many similar properties including: Click the links or see below for more details on each. The elements of the alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium. Hydrogen and the alkali metals make up the group 1 elements of the periodic table. The only element in the first column that is not usually considered an alkali metal is hydrogen. They are all in the first column of the periodic table. The alkali metals are a group of elements in the periodic table.
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