18
Ar
Argon
Argon
Argon (Ar)
Noble Gases · Gas · Period 3 · Group 18
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Element Properties
- Atomic Number
- 18
- Symbol
- Ar
- Atomic Mass
- 39.9
- Category
- Noble Gases
- Standard State
- Gas
- Period
- 3
- Group
- 18
- Electronegativity
- —
- Atomic Radius
- 188
- Ionization Energy
- 15.76
- Electron Affinity
- —
- Oxidation States
- 0
- Melting Point
- 83.8 K (-189.35 °C)
- Boiling Point
- 87.3 K (-185.85 °C)
- Density
- 0.001784
- Electron Configuration
- [Ne]3s2 3p6
- Year Discovered
- 1894
Frequently asked questions
What is the atomic number of Argon?
The atomic number of Argon is 18, which equals the number of protons in its nucleus.
What is the atomic mass of Argon?
The atomic mass of Argon is approximately 39.9 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Argon?
The electron configuration of Argon is [Ne]3s2 3p6.
Where is Argon in the periodic table?
Argon is located in period 3, group 18.
When was Argon discovered?
Argon was discovered in 1894.
Related elements
Same group
2
He
Helium
4.003
10
Ne
Neon
20.18
36
Kr
Krypton
83.8
54
Xe
Xenon
131.29
86
Rn
Radon
222.018
118
Og
Oganesson
295.216