He was a very excellent student before he turned to delinquency.

He has a violent character.

Ununhexium is an element that is not yet fully understood.

Strontium is one of the elements abundantly present in the earth's crust.

The soundtrack of this movie is wonderful.

Lawrencium is one of the heaviest elements in the periodic table.

The great auk is a species of bird that has become extinct.

Deuterium is one of the isotopes of hydrogen.

He recites the Light Mantra every day.

He is fighting against illness.