Oxygen, which is one of the chemical elements, is necessary for us to breathe.

Darmstadtium is one of the chemical elements, also known as Darmstadtium.

Darmstadtium is one of the chemical elements.

He ate one apple.

She called him by his name.

He is called the smartest in the class.

He often gets treated to dinner by his friends.

Hydrogen is the most abundant element in the universe.

He is majoring in chemistry at university.

He is an expert in chemistry.