Aaaannnddd - the last of the
naturally occuring elements: URANIUM!
Uranium is of great interest because of its application to nuclear power and nuclear weapons. Uranium contamination is an emotive environmental problem. It is not particularly rare and is more common than beryllium or tungsten for instance.
•Name: Uranium
•Symbol: U
•Atomic number: 92
•Atomic weight: 238.02891 (3) [see notes g m
...•Standard state: solid at 298 K
•CAS Registry ID: 7440-61-1
•Group in periodic table:
•Group name: Actinoid
•Period in periodic table: 7 (actinoid)
•Block in periodic table: f-block
•Color: metallic grey
•Classification: Metallic
Historical information
Uranium was discovered by Martin Klaproth at 1789 in Germany. Named after the planet Uranus, which at the time had just been discovered. A yellow glass containing more than 1% uranium oxide dating back to 79 AD was found near Naples in Italy. Klaproth recognized an unknown element in pitchblende and attempted to isolate the metal in 1789. However, uranium metal itself was first isolated in 1841 by Eugene-Melchoir Peligot, who reduced the anhydrous chloride UCl4 with potassium. The radioactive nature of uranium was not appreciated for another 55 years when in 1896 Henri Becquerel detected its radioactivity.
Uranium gives interesting yellow and green colours and fluorescence effects when included to glass in conjunction with other additives. There is a type of glass manufactured by the Uranium Glass Gallery in Japan, where you can find further information about uranium glass. This type of glass is sometimes referred to as "vaseline glass" in the UK and USA and as "Annagelb" (yellow) or "Annagruen" (green) in Germany. It is a very strange, greenish yellow type of glass that at one point was put into tableware because of the color produced.
Physical properties
•Melting point: 1405.3 [or 1132.2 °C (2070 °F)] K
•Boiling point: 4200 [or ca.3900 °C (7101 °F)] K
•Density of solid: 19050 kg m-3
Orbital properties
•Ground state electron configuration: [Rn].5f3.6d1.7s2
•Shell structure: 2.8.18.32.21.9.2
•Term symbol: 5L6
Well...onward from here it is the synthesized elements....only 26 more until we're done with the periodic table!
Uranium is of great interest because of its application to nuclear power and nuclear weapons. Uranium contamination is an emotive environmental problem. It is not particularly rare and is more common than beryllium or tungsten for instance.
•Name: Uranium
•Symbol: U
•Atomic number: 92
•Atomic weight: 238.02891 (3) [see notes g m
...•Standard state: solid at 298 K
•CAS Registry ID: 7440-61-1
•Group in periodic table:
•Group name: Actinoid
•Period in periodic table: 7 (actinoid)
•Block in periodic table: f-block
•Color: metallic grey
•Classification: Metallic
Historical information
Uranium was discovered by Martin Klaproth at 1789 in Germany. Named after the planet Uranus, which at the time had just been discovered. A yellow glass containing more than 1% uranium oxide dating back to 79 AD was found near Naples in Italy. Klaproth recognized an unknown element in pitchblende and attempted to isolate the metal in 1789. However, uranium metal itself was first isolated in 1841 by Eugene-Melchoir Peligot, who reduced the anhydrous chloride UCl4 with potassium. The radioactive nature of uranium was not appreciated for another 55 years when in 1896 Henri Becquerel detected its radioactivity.
Uranium gives interesting yellow and green colours and fluorescence effects when included to glass in conjunction with other additives. There is a type of glass manufactured by the Uranium Glass Gallery in Japan, where you can find further information about uranium glass. This type of glass is sometimes referred to as "vaseline glass" in the UK and USA and as "Annagelb" (yellow) or "Annagruen" (green) in Germany. It is a very strange, greenish yellow type of glass that at one point was put into tableware because of the color produced.
Physical properties
•Melting point: 1405.3 [or 1132.2 °C (2070 °F)] K
•Boiling point: 4200 [or ca.3900 °C (7101 °F)] K
•Density of solid: 19050 kg m-3
Orbital properties
•Ground state electron configuration: [Rn].5f3.6d1.7s2
•Shell structure: 2.8.18.32.21.9.2
•Term symbol: 5L6
Well...onward from here it is the synthesized elements....only 26 more until we're done with the periodic table!
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