The group 1 of the periodic table contains 6 elements namely Lithium ,Sodium ,Potassium, rubidium, caesium and francium. They are usually referred to as alkali metals since their oxides and hydroxides are soluble in water and form strong bases or alkalies. Alkali metals are highly reactive and hence do not occur in the free state but are widely distributed in nature in … [Read more...] about Physical properties of s-block elements