Hydrogen is the lightest and most abundant element in the universe, making up about 75% of the mass of all normal matter. It is a colorless, odorless, and tasteless gas that is highly flammable. Hydrogen is made up of two atoms that are linked together by a single bond.

 

Hydrogen is found in almost all molecules in living things, including water, plants, animals, and humans. It is also present in the atmosphere, but only in tiny amounts - less than one part per million by volume. Most of the hydrogen on Earth exists in molecular forms such as water and organic compounds.

 

Hydrogen is a versatile and important element that plays a vital role in the universe and on Earth. It is a key component of many natural substances, and it has a wide range of potential applications in technology and energy.