Question

write the ocurrence of alkali metals and alkaline earth metals?

Answer 1

Alkali metals are usually found as oxides in earths crust, Na & K are amongst the top 10 most abundant metals in earths crust.
Lithium is ususally found in sea, Ru is also fairly abundant, but Fr is relatively rare.

Alkaline earth metals are also found as oxides.
Ca & Mg are quite abundant in earth's crust. Be is fairly rare, Sr is present in considerable quantities whereas, Ba is again rare.