This metal is undergoing corrosion.

Acid rain corrodes the surface of buildings.

We should go forward.

He voluntarily took on the job.

We will contact you as soon as we confirm the progress of the construction.

This metal is very hard.

Transition metals play an important role in chemical reactions.

When he opened the door, a metallic sound echoed.

Alkali metals are very reactive chemically.

Metallic bonds are formed by ions floating in a sea of electrons.