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Helium (from Ancient Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements, and it does not have a melting point at standard…
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Helium | 3He | 0.0002% | 1.00 | infobox |
| Helium | 4He | 99.9998% | 1.00 | infobox |
| Helium | Appearance | colorless gas, exhibiting a gray, cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field | 1.00 | infobox |
| Helium | Atomic number (Z) | 2 | 1.00 | infobox |
| Helium | Atomic radius | empirical: 31 pm | 1.00 | infobox |
| Helium | Block | s-block | 1.00 | infobox |
| Helium | Boiling point | 4.222 K (−268.928 °C, −452.070 °F) | 1.00 | infobox |
| Helium | CAS Number | 7440-59-7 | 1.00 | infobox |
| Helium | Covalent radius | 28 pm | 1.00 | infobox |
| Helium | Critical point | 5.1953 K, 0.22746 MPa | 1.00 | infobox |
| Helium | Crystal structure | hexagonal close-packed (hcp) | 1.00 | infobox |
| Helium | Density (at STP) | 0.1786 g/L | 1.00 | infobox |
| Helium | Discovery | Norman Lockyer (1868) | 1.00 | infobox |
| Helium | Electron configuration | 1s2 | 1.00 | infobox |
| Helium | Electronegativity | Pauling scale: no data | 1.00 | infobox |
| Helium | Electrons per shell | 2 | 1.00 | infobox |
| Helium | First isolation | William Ramsay, Per Teodor Cleve, Abraham Langlet (1895) | 1.00 | infobox |
| Helium | Group | group 18 (noble gases) | 1.00 | infobox |
| Helium | Heat of fusion | 0.0138 kJ/mol | 1.00 | infobox |
| Helium | Heat of vaporization | 0.0829 kJ/mol | 1.00 | infobox |
| Helium | Ionization energies | 1st: 2372.3 kJ/mol | 1.00 | infobox |
| Helium | Ionization energies | 2nd: 5250.5 kJ/mol | 1.00 | infobox |
| Helium | Magnetic ordering | diamagnetic | 1.00 | infobox |
| Helium | Main isotopes | .mw-parser-output .isotopes-table{text-align:center;width:100%;border-collapse:collapse;margin:0;padding:0}.mw-parser-output .isotopes-table-headers>:not(:first-child){padding:0… | 1.00 | infobox |
| Helium | Molar heat capacity | 20.78 J/(mol·K) | 1.00 | infobox |
| Helium | Molar magnetic susceptibility | −1.88×10−6 cm3/mol (298 K) | 1.00 | infobox |
| Helium | Naming | after Helios, Greek god of the Sun | 1.00 | infobox |
| Helium | Natural occurrence | primordial | 1.00 | infobox |
| Helium | Oxidation states | common: (none) | 1.00 | infobox |
| Helium | P (Pa) | Vapor pressure (defined by ITS-90) P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1.23 1.67 2.48 4.21 | 1.00 | infobox |
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