Why are the elements of group 1 is called alkali metals?
Answers
Solution :
▪ General electronic configuration = ns
▪ The elements of group 1 : Lithium, sodium, potassium, rubidium, caesium and francium besides hydrogen.
▪ These elements are called alkali metals because they form hydroxides on reaction with water which are strongly alkaline in nature.
Elements in which the last electron enters the s-orbital are called s-block elememts.
▶ Physical properties :
▪ Alkali metals are soft with low melting and boiling points due to weak metallic bonding.
▪ Alkali metals have low density which increases down the group from Li to Cs.
▪ On exposure to moist air, all alkali metals except lithium get tarnished quickly so they are always kept in kerosene to protect them from air.
▪ All alkali metals are paramagnetic but their salts are diamagnetic in nature.
Explanation:
These metals are called alkali metals because they form alkalies( i.e. strong bases capable of neutralizing acids) when they react with water. ... The group 1 of the periodic table contain six elements namely Lithium(Li), Sodium(Na),Potassium(K),Rubidium(Rb),Cesium(Cs) and Francium(Fr).
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