Many metals react with oxygen to form metal oxides. Potassium and sodium are soft metal which are easily cut exposing a shiny surface which changes to dull rapidly. The change from shiny to dull is called tarnishing.

What metal reacts well with oxygen?

Oxygen is very reactive with Alkali metals. Alkali metals are given the name alkali because the oxides of these metals react with water to form a metal hydroxide that is basic or alkaline. Lithium produces an oxide, sodium produces a peroxide, and potassium, cesium, and rubidium produce superoxides.

What metals Cannot react with oxygen?

- The noble metals are the ones that do not react with oxygen gas and do not get corroded. The metals like Gold, Platinum, Silver, Ruthenium, etc are the examples of noble metals. - So, Platinum whose chemical symbol is Pt does not react with oxygen. - The other metals given in the options are Zinc, Titanium and Iron.