18 Ar
Noble gas
Argon
Inert gas in welding and bulbs.
Properties of Argon
- Atomic number (Z)
- 18
- Symbol
- Ar
- Atomic mass
- 39.948 g/mol
- Category
- Noble gas
- Group
- 18
- Period
- 3
- Electron configuration
- [Ne] 3s² 3p⁶
- Electronegativity (Pauling)
- —
- Atomic radius
- 71 pm
- First ionization energy
- 1521 kJ/mol
- Melting point
- 83.8 K (-189.3 °C)
- Boiling point
- 87.3 K (-185.8 °C)
- Density
- 0.001784 g/cm³
- Phase at 25 °C
- Gas
- Discovered
- Discovered in 1894
Frequently asked questions
What is Argon?
Argon (Ar) is a noble gas, element number 18 on the periodic table. Inert gas in welding and bulbs.
What is the atomic number and atomic mass of Argon?
Argon has atomic number 18 and an atomic mass of about 39.948 g/mol.
What is the electron configuration of Argon?
The electron configuration of Argon is [Ne] 3s² 3p⁶.
Where is Argon on the periodic table?
Argon sits in group 18, period 3, and is classified as a noble gas.