He studies classical literature and repeats old words.

He is an important character.

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.

His complexion turned lead-colored.

He got lead poisoning while doing repair work in an old house.

This vitamin supplement contains zinc.

Lead(II) acetate was used as a sweetener, but its toxicity became a problem.