Roentgenium | Wikipedia audio article
Channel: wikipedia tts
Date: 08/12/2018

This is an audio version of the Wikipedia Article:
Roentgenium


00:01:07 1 History
00:01:16 1.1 Official discovery
00:02:34 1.2 Naming
00:03:38 2 Isotopes
00:04:27 2.1 Stability and half-lives
00:06:00 3 Predicted properties
00:06:09 3.1 Chemical
00:09:06 3.2 Physical and atomic
00:09:39 4 Experimental chemistry
00:09:48 5 See also
00:11:42 6 References
00:11:52 7 External links
00:13:30 undefined



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SUMMARY
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Roentgenium is a chemical element with symbol Rg and atomic number 111. It is an extremely radioactive synthetic element that can be created in a laboratory but is not found in nature. The most stable known isotope, roentgenium-282, has a half-life of 100 seconds, although the unconfirmed roentgenium-286 may have a longer half-life of about 10.7 minutes. Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany. It is named after the physicist Wilhelm Röntgen (also spelled Roentgen), who discovered X-rays.
In the periodic table, it is a d-block transactinide element. It is a member of the 7th period and is placed in the group 11 elements, although no chemical experiments have been carried out to confirm that it behaves as the heavier homologue to gold in group 11 as the ninth member of the 6d series of transition metals. Roentgenium is calculated to have similar properties to its lighter homologues, copper, silver, and gold, although it may show some differences from them.