Helium (He)
Helium is the second lightest and second most abundant element in the observable universe. It is a colorless, odorless, tasteless, non-toxic noble gas.
Properties of Helium
- Atomic number
- 2
- Category
- Noble Gas
- Atomic mass
- 4.0026 u
- Electron configuration
- 1s²
- Melting point
- 0.95 K (-272.2 °C)
- Boiling point
- 4.22 K (-268.93 °C)
- Density
- 0.0001785 g/cm³
- Appearance
- Colorless gas
- Discovered by
- Pierre Janssen (1868)
Facts about Helium
- Helium makes your voice sound squeaky because sound travels faster through it!
- Helium was first discovered in the Sun before it was found on Earth!
- Helium balloons float because helium is lighter than air!
- Helium is so light that it can escape Earth's gravity and float into space!