Which of the following alkali metals form only, the normal oxide, M_(2)O on heating in air ?(where M is the alkali metal)

Which of the following alkali metals form only, the normal oxide, M_(2

1.	Which of the following alkali metals form only, the normal oxide, M_(2)O on heating in air ?(where M is the alkali metal)
Answer» Rb K LI Na. Solution :Li FORMS only the NORMAL OXIDE, `Li_(2)O`