Here are basic facts about the first element in the periodic table, hydrogen.
- Atomic Number: 1
Hydrogen is the first element in the periodic table, meaning it has an atomic number of 1 or 1 proton in each hydrogen atom.
- Atomic Weight: 1.00794
This makes hydrogen the lightest element.
- Hydrogen is the most abundant element. About 75% of the element mass of the universe is hydrogen.
- The most common isotope of hydrogen is protium, which has 1 proton and 0 neutrons.
- Hydrogen gas is extremely flammable. It is used as a fuel by the space shuttle main engine and was associated with the famous explosion of the Hindenburg airship.
- Hydrogen compounds commonly are called hydrides.
- Hydrogen may be produced by reacting metals with acids (e.g., zinc with hydrochloric acid).
- The physical form of hydrogen at room temperature and pressure is a colorless and odorless gas.
- Hydrogen has many uses, though most hydrogen is used for processing fossil fuels and in the production of ammonia.
- In compounds, hydrogen can take a negative charge (H-) or a positive charge (H+).