When the alkali metals are cut, they initially appear shiny grey but quickly become dull and white as they react with oxygen in the air. This is known as tarnishing. Sodium tarnishes more quickly ...

Sodium would react very quickly with water ... metals change colour slowly the least reactive metals do not react with oxygen Caesium (Cs) is one of the most reactive metals.

The atom with eight protons in its nucleus (atomic number 8) is oxygen. Each energy level ... and hydrogen gas which ignites. The reaction of the potassium with water is similar to the reaction of ...

and its reaction under these conditions appears not to be well known. We have observed that mixtures of sodium citrate and ferrous sulphate, shaken in air at 28° C. and pH 6.0, absorbed oxygen in ...