Difference between revisions of "Helium"
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| − | {{Element | name=Helium| symbol=He | anumber=2 | amass=4.0026 amu | | + | {{Element |
| − | '''Helium''' is the second element on the [[periodic table of the elements]]<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> | + | | name=Helium |
| + | | image= | ||
| + | | caption= | ||
| + | | symbol=He | ||
| + | | anumber=2 | ||
| + | | class=Group 18, [[Noble gas]] | ||
| + | | amass=4.0026 amu | ||
| + | | stableisotopes= | ||
| + | | unstableisotopes= | ||
| + | | meltingpoint=-272.2 (''26 atm'') | ||
| + | | boilingpoint=-268.6 | ||
| + | | density=0.1785 (''per liter'')<br/>0.1380 (''relative'') | ||
| + | | hardness= | ||
| + | | abundance=5 x 10<sup>-4</sup> | ||
| + | | oxidation= | ||
| + | | date= August 18, 1868 | ||
| + | | discname=Pierre Janssen | ||
| + | | origname=from [[Greek mythology]]: [[Helios]] the sun god | ||
| + | | uses= | ||
| + | | obtained= | ||
| + | }} | ||
| + | '''Helium''' is the second element on the [[periodic table of the elements]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> It is also the second most abundant element in the universe, after [[hydrogen]]. Modern physicists have acertained than most of the helium origanated from the [[Big Bang]];<ref>For a detailed account of this see: http://www.lbl.gov/abc/wallchart/chapters/10/0.html</ref> however this is disputed by all forms of [[creationists]].<ref>See http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v509n1/985623/985623.web.pdf</ref> Both groups generally agree is that subsequently helium has been created by [[nuclear fusion]] in the center of stars.<ref>A detailed account of this can be found at http://zebu.uoregon.edu/textbook/energygen.html</ref> Helium is also the by-product of alpha-particle radioactivity. Radioactive decay of heavy elements deep inside the [[Earth]] sends helium leaking into natural gas wells, from which it is obtained for commercial use. The atomic weight of Helium-4, the most common isotope, is 4.002603254. | ||
| − | Helium has an interesting history; during the nineteenth century, one of the things some scientists declared to be "impossible"<ref>[http://www.astrophysical.org/astrophysics.php Astrophysical.org]</ref> was the determination of the chemical makeup of the stars. Then spectroscopy was developed, and the composition of the stars became known in great detail. Helium, in particular, was discovered in the Sun (as an unknown element) ''before'' it was discovered on the Earth. It was, accordingly, named after ''Helios,'' the Greek | + | Helium has an interesting history; during the nineteenth century, one of the things some scientists declared to be "impossible"<ref>[http://www.astrophysical.org/astrophysics.php Astrophysical.org]</ref> was the determination of the chemical makeup of the stars. Then spectroscopy was developed, and the composition of the stars became known in great detail. Helium, in particular, was discovered in the Sun (as an unknown element) ''before'' it was discovered on the Earth. It was, accordingly, named after ''Helios,'' the Greek god of the Sun. It was first found in natural gas in 1905 at the [[University of Kansas]].<ref>http://www.news.ku.edu/2000/00N/AprNews/Apr7/bailey.html</ref> |
==Notes and references== | ==Notes and references== | ||
<references/> | <references/> | ||
| − | + | {{Periodic table}} | |
[[Category:Elements]] | [[Category:Elements]] | ||
Revision as of 10:12, August 31, 2019
| Helium | |
|---|---|
| Properties | |
| Atomic symbol | He |
| Atomic number | 2 |
| Classification | Group 18, Noble gas |
| Atomic mass | 4.0026 amu |
| Melting point (°C) | -272.2 (26 atm) |
| Boiling point (°C) | -268.6 |
| Density (grams per cc) | 0.1785 (per liter) 0.1380 (relative) |
| Abundance in lithosphere (%) | 5 x 10-4 |
| Other Information | |
| Date of discovery | August 18, 1868 |
| Name of discoverer | Pierre Janssen |
| Name origin | from Greek mythology: Helios the sun god |
Helium is the second element on the periodic table of the elements.[1] It is also the second most abundant element in the universe, after hydrogen. Modern physicists have acertained than most of the helium origanated from the Big Bang;[2] however this is disputed by all forms of creationists.[3] Both groups generally agree is that subsequently helium has been created by nuclear fusion in the center of stars.[4] Helium is also the by-product of alpha-particle radioactivity. Radioactive decay of heavy elements deep inside the Earth sends helium leaking into natural gas wells, from which it is obtained for commercial use. The atomic weight of Helium-4, the most common isotope, is 4.002603254.
Helium has an interesting history; during the nineteenth century, one of the things some scientists declared to be "impossible"[5] was the determination of the chemical makeup of the stars. Then spectroscopy was developed, and the composition of the stars became known in great detail. Helium, in particular, was discovered in the Sun (as an unknown element) before it was discovered on the Earth. It was, accordingly, named after Helios, the Greek god of the Sun. It was first found in natural gas in 1905 at the University of Kansas.[6]
Notes and references
- ↑ Wile, Dr. Jay L. Exploring Creation With Physical Science. Apologia Educational Ministries, Inc. 1999, 2000
- ↑ For a detailed account of this see: http://www.lbl.gov/abc/wallchart/chapters/10/0.html
- ↑ See http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v509n1/985623/985623.web.pdf
- ↑ A detailed account of this can be found at http://zebu.uoregon.edu/textbook/energygen.html
- ↑ Astrophysical.org
- ↑ http://www.news.ku.edu/2000/00N/AprNews/Apr7/bailey.html
| Periodic Table of the Elements | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |||||||
2
He 4.003 | ||||||||||||||||||||||||
| *Lanthanides | ||||||||||||||||||||||||
| **Actinides | ||||||||||||||||||||||||
