Give brief on abundance of alkali metal and alkaline earth metal in ea

1.	Give brief on abundance of alkali metal and alkaline earth metal in earth crust.
Answer» Solution : Among the alkali metals sodium and potassium are abundant and lithium, rubidium and caesium have MUCH lower abundances. Francium is highly radioactive, its longest-lived isotope `""^(223)Fr` has a half-life of only 21 minutes. Of the alkaline earth metals calcium and magnesium rank fifth and sixth in abundance respectively in the earth.s crust. Strontium and BARIUM have much lower abundances. Beryllium is rare and radium is the rarest of all comprising only `10^(-10)` per CENT of IGNEOUS ROCKS.

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