* The most abundant element in the universe. It makes up about 75% of the universe's elemental mass.

* The lightest element. It has only one proton and one electron.

* A colorless, odorless, and tasteless gas. It is highly flammable and explosive when mixed with air.

* A versatile element. It has a wide range of applications, including fuel, fertilizer production, and rocket propellant.

* A potential clean energy source. Hydrogen can be used to generate electricity without producing carbon emissions.

While it's technically correct to say hydrogen is the "simplest" element due to its atomic structure, this term is not as common or as descriptive as some of the others listed above.