Identify a phenomenon from the following that the oxygen gas molecules accumulate on the surface of tungsten by means of chemical bonds.

The accumulation of gas molecules on the surface of a solid is known as adsorption.

When the gas molecules are held to the solid surface by chemical bonds, the phenomenon is specifically called chemical adsorption or chemisorption.

Since oxygen gas molecules accumulate on the surface of tungsten by means of chemical bonds, this process is chemisorption.

Answer: Chemisorption