Silver is actually not very reactive with oxygen at normal temperatures and pressures. Unlike many other metals that readily form oxides when exposed to air, silver forms a very thin, protective layer of silver oxide (Ag₂O) that prevents further oxidation. This layer is so thin that it's almost invisible and acts as a barrier against further corrosion.

However, there are some factors that can increase silver's reactivity with oxygen:

* High temperatures: Heating silver in the presence of oxygen will accelerate the oxidation process.

* Presence of other substances: Certain substances, like sulfur compounds, can promote the formation of silver sulfide (Ag₂S), which is a black tarnish that can be more visible than silver oxide.

* High humidity: Moisture can accelerate the formation of silver oxide and sulfide.

Here's a summary:

* Normal conditions: Silver is relatively unreactive with oxygen, forming a thin protective layer of silver oxide.

* Extreme conditions: High temperatures, sulfur compounds, and high humidity can increase silver's reactivity with oxygen.

This low reactivity is why silver is often used in jewelry, silverware, and other applications where its luster and resistance to corrosion are valued.