[kevinnn]

  Ok, so tommorow I have a mini quiz and I just want to make shore I have this right.   Lithium will react with oxygen to form lithium oxide. Sodium will react with oxygen to form sodium oxide. Potassium will react with oxygen to form potassium peroxide. Rubidium will react with oxygen to form rubidium superoxide. And cesium will react with oxygen to form cesium super oxide. Are these correct?  Anything else I should know with relation to this? Thanks. 

[vmelkon]

Mostly yes. For rubidium and and cesium various other oxides form as well (suboxides).

[cheese (MSW)]

When the [group 1] metals are burned in a free supply of air the predominant product depends on the metal: Li forms the oxide Li2O (plus some Li2O2), Na forms the peroxide Na2O2 (plus someNa2O) whilst K, Rb and Cs form the superoxide MO2.
N. N. Greenwood, A. Earnshaw, Chemistry of the Elements 2nd ed. (1997) p 84.

[vmelkon]

When the [group 1] metals are burned in a free supply of air the predominant product depends on the metal: Li forms the oxide Li2O (plus some Li2O2), Na forms the peroxide Na2O2 (plus someNa2O) whilst K, Rb and Cs form the superoxide MO2.
N. N. Greenwood, A. Earnshaw, Chemistry of the Elements 2nd ed. (1997) p 84.

Would it be different if instead of "burning" them you leave them out in O2 at 20 degreeC?