Solid phase
- Official name
- solid alpha Argon
- Secondary names
- solid alpha-Ar; alpha-Ar
- CAS number
- 7440-37-1
- Family
- covalent network solid
- Class
- tridimentional covalent network solid
- Compound type
- elemental solid
- Formula
- $Ar$
- Chemical formula
- Ar
- Elemental formula
- Ar
- Isotope mixture type
- terrestrial abundance
- Class
- molecular solids with apolar molecules (01)
- Type
- with monoatomic apolar molecules (A) (01.01)
- Equivalent liquid
- Liquid Argon
- Phase name
- $\alpha$-phase
- Phase type
- crystalline
- Crystal system
- isometric (cubic)
- Crystal class
- hexoctahedral
- Crystal class symbol
- m-3m (Oh)
- Crystal spacegroup
- Fm-3m
- Molar mass
- 39.948 $g/mol$
- Density
- 1.622 (83 K) - 1.77 (20K) ( $g/cm^3$
- State NTP
- gas
- Phase transitions
-
Phase transition type Other phases Temperature - Pressure solid-liquid liquid Ar 83.81 K (−189.34 °C)
- Refringence type
- isotropic
- Refraction index $n_{\alpha}$
- 1.265 (83.8K) - 1.307 (20 K) @578 nm
- Pure color
- colorless
- Diaphaneity
- transparent
- Luster
- vitreous