Hydrogen (H)
Hydrogen is the lightest and most abundant element in the universe, making up about 75% of all normal matter by mass.
Properties of Hydrogen
- Atomic number
- 1
- Category
- Nonmetal
- Atomic mass
- 1.008 u
- Electron configuration
- 1s¹
- Melting point
- 13.99 K (-259.16 °C)
- Boiling point
- 20.27 K (-252.88 °C)
- Density
- 0.00008988 g/cm³
- Electronegativity (Pauling)
- 2.2
- Appearance
- Colorless gas
- Discovered by
- Henry Cavendish (1766)
Facts about Hydrogen
- Hydrogen is the fuel that powers the Sun and all other stars!
- Water is made of two hydrogen atoms and one oxygen atom — that's why it's called H₂O!
- Hydrogen is the lightest element — it weighs almost nothing!
- NASA uses liquid hydrogen as rocket fuel to launch spacecraft into space!
Hydrogen videos
- Stars Are Made Mostly of Hydrogen
- Hydrogen Means "Water Maker"
- The Invisible Hydrogen Flame
- Liquid Hydrogen Rocket Fuel
- Hydrogen-filled soap bubbles igniting in chain-reaction fireballs
- Hydrogen: The Fuel of the Sun
- Water Is Two Hydrogens and One Oxygen
- Hydrogen Is the Lightest Element
- Liquid Hydrogen Rocket Fuel