Chromium is a highly reactive metal present in many iron alloys.

For example, all of the elements in the first column (excluding hydrogen) are very highly reactive metals.

More reactive metals are more abundant in the earth's crust as one can see by looking at the grass.

It melts at a quite high temperature for a reactive metal.

They can help you to make sure that appropriate safeguards are in-place before working with this highly reactive metal.

Manganese is one of the most reactive metals, as you can see.

All of these examples use aluminium as the reactive metal.

In principle, any reactive metal could be used instead of aluminium.

It makes aluminum, actually a very reactive metal, extremely resistant to dissolving in the sea water.

This is especially important with highly reactive metals, such as magnesium and titanium.