Helium
| Atomic number: |
2 |
|
Atomic weight: |
4.002602 |
|
| Shells: |
2 |
|
Orbitals: |
1s2 |
|
| Melting point: |
-272.2°C @ 26 atmos. |
|
Boiling point: |
-268.934°C |
|
| Covalent radius: |
0.93 |
Å |
Atomic volume: |
19.5 |
cm³/mol |
| Atomic radius: |
0.49 |
Å |
Ionic radius: |
-- |
Å |
| Electronegativity: |
0 |
|
Oxidation states: |
|
|
| 1st ionization pot.: |
24.5874 |
V |
2nd ionization pot.: |
54.416 |
V |
| 3rd ionization pot.: |
-- |
V |
Specific heat: |
5.193 |
J/gK |
| Heat of fusion: |
-- |
kJ/mol |
Heat of vapor.: |
0.0845 |
kJ/mol |
| Thermal conduct.: |
0.00152 |
W/cmK |
Electrical conduct.: |
-- |
10^6/cm ohm |
| Density: |
0.0001787 |
g/cm³ |
Valence: |
0 |
|
