Helium (He)
General Properties
| Symbol | He |
|---|---|
| Atomic Number | 2 |
| Atomic Weight | 4.002602 |
| Group |
18 (noble gases or helium family/neon family)
VIII (IUPAC), VIIIA (CAS)
Gas, Diamagnetic, Noble Gas, Nonmetal, Stable, Natural
|
| Period | 1 |
| Block | s |
Physical Properties
| Density | 0.0001785 g/cm3 |
|---|---|
| Atomic Volume | 31.8 cm3/mole |
| Atomic Radius | -- |
| Covalent Radius | 32 pm |
| Crust Abundance | 5.5E-7% |
| Crystal Structure | Hexagonal |
| Color | Colorless |
States
| Melting Point | -272.2 °C |
|---|---|
| Boiling Point | -268.9 °C |
| Heat of Fusion | 0.021 kJ/mol |
| Heat of Vaporization | 0.0845 kJ/mol |
Energy
| Electronegativity | (Pauling Scale) |
|---|---|
| Electron Affinity | 0 kJ/mol |
| 1st Ionization Energy | 2377 kJ/mol |
| 2. Ionization Energy | 5250.5 kJ/mol |
| Specific Heat Capacity | 5.193 J g−1 K−1 |
| Thermal Conductivity | 0.152 W·m−1·K−1 |
Electrons & Oxidation
| Oxidation States | 0 |
|---|---|
| Electrons Per Shell | 2 |
| Electron Configuration | 1s2 |
|
Orbital Diagram
1s ↿⇂ |
|
Nuclear
| Radioactive | No |
|---|
Media
- Description
- Light, odorless, colorless, tasteless inert gas. Second most abundant element in the universe. Sixth most abundant in the earth's atmosphere.
- Uses
- Used in balloons, deep sea diving & welding. Also used in very low temperature research.
- Sources
- Found in natural gas deposits & in the air (5 parts per billion) Constantly lost to space; replenished by radioactive decay (alpha particles).
- Pronounciation (English)
- HEE-li-em
Translations
| Afrikaans | Helium | |
| Aragonese | Elio | |
| العربية | هيليوم | |
| Armãneashte | Heliumu | |
| asturianu | Heliu | |
| azərbaycan dili | Helium | |
| български | Хелий | |
| বাংলা | হিলিয়াম | |
| brezhoneg | Heliom | |
| bosanski | Helij[um] | |
| Byelorussian | Гелій | |
| Cebuano | Helio | |
| čeština | Helium | |
| Chuvash | Гели | |
| Cymraeg | Heli | |
| dansk | Helium | |
| Deutsch | Helium | |
| Ελληνικά | Ήλιον | |
| English | Helium | |
| esperanto | Helio | |
| español | Hélio | |
| eesti | Heelium | |
| euskara | Helioa | |
| فارسی | هلیم | |
| suomi | Helium | |
| føroyskt | Helium | |
| français | Hélium | |
| furlan | Eli | |
| West-Frysk | Helium | |
| Gaeilge | Héiliam | |
| Gàidhlig | Hèiliam | |
| galego | Helio | |
| ગુજરાતી | હીલિયમ | |
| Gaelg | Hailium | |
| Hakka Chinese | Hoi (氦) | |
| עברית | הליום | |
| हिन्दी | हिलियम | |
| hrvatski | Helij | |
| magyar | Hélium | |
| հայերեն | Հելիում | |
| Indonesia | Helium | |
| íslenska | Helín | |
| italiano | Elio | |
| 日本語 | ヘリウム | |
| ქართული | ჰელიუმი | |
| کٲشُر | Él | |
| қазақ тілі | Гелий | |
| 한국어 | 헬륨 | |
| Kurdish | Hêlyûm | |
| Komi | Гелий | |
| kernewek | Helyum | |
| кыргызча | Гелий | |
| Latin | Helium | |
| Lëtzebuergesch | Helium | |
| Lombard | Éli | |
| lingála | Eliyúmu | |
| lietuvių | Helis | |
| latviešu | Hēlijs | |
| Mari | Гелий | |
| Maori | Haumāmā | |
| македонски | Хелиум | |
| മലയാളം | ഹീലിയം | |
| монгол | Гели | |
| Мокшан | Гели | |
| Bahasa Melayu | Helium | |
| Malti | Ħiljum, ²Elju | |
| Nahuatl | Tōnatiuyoh | |
| Nederlands | Helium | |
| norsk | Helium | |
| Occitan | Eli | |
| ирон | Гелий | |
| polski | Hel | |
| português | Hélio | |
| Runasimi | Ilyu | |
| română | Heliu | |
| русский | Гелий | |
| slovenčina | Hélium | |
| slovenščina | Helij | |
| Samoan | Helimi | |
| Samogitian | Helis | |
| shqip | Helium | |
| српски | Хелијум | |
| Southern Sotho | Heliamo | |
| svenska | Helium | |
| Kiswahili | Heli | |
| தமிழ் | ஹீலியம் | |
| Tajik | Гелий | |
| ไทย | ฮีเลียม | |
| Türkçe | Helyum | |
| ئۇيغۇرچە | گېلىي | |
| українська | Гелій | |
| o‘zbek | Geliy | |
| Tiếng Việt | Heli | |
| Võro | Heelium | |
| 中文 | 氦 |
History
- Discovered In
- 1895
- Discovered By
- William Ramsay
- Discovered At
- London, England
- Word Origin
- From the Greek word "helios" meaning "sun"