| Element (Atom) Name | Helium |
| Symbol | He |
| Physical state at room temperature | Gas |
| Element Classification | Non-metal |
| Group Name | Noble Gas |
| Period Number (Periodic table) | 1 |
| Group number (Periodic table) | 18 |
| Atomic number | 2 |
| Atomic weight | 4.002602 (Ref: Jlab-ele002, ciaaw-helium, Nist-2) 4.003 (Ref: Lanl-2) |
| Atomic Radius | 140 pm (Van der Waals) (Ref: Lanl-2) |
| Density | 0.0001785 g/cm3 (Ref: Jlab-ele002) |
| Melting point | -272.2°C (Ref: Jlab-ele002, Lanl-2) |
| Boiling point | -268.93°C (Ref: Jlab-ele002, Lanl-2) |
| Electron shell configuration | 1s2 |
| Oxidation States | 0 (Ref: Jlab-ele002, Lanl-2) |
| Ionization Energy | 24.587 eV (Ref: Jlab-ele002) 24.587389011 eV (Ref: Nist-2) |
| Number of Stable Isotopes | 2 |
| InChI | InChI=1S/He (ref: Pubchem-2) |
| InChI Key | SWQJXJOGLNCZEY-UHFFFAOYSA-N (ref: Pubchem-2) |
| Remarks |
REFERENCES
- Jlab-ele002: https://education.jlab.org/itselemental/ele002.html
- Lanl-2: https://periodic.lanl.gov/2.shtml
- ciaaw-helium: https://www.ciaaw.org/helium.htm
- Nist-2 : https://physics.nist.gov/cgi-bin/Elements/elInfo.pl?element=2
- Pubchem-2: https://pubchem.ncbi.nlm.nih.gov/element/2
- science.co.il: https://www.science.co.il/elements/
