Roentgenium (German:[ʁœntˈɡeːni̯ʊm]ⓘ) is a synthetic chemical element; it has symbol Rg and atomic number 111. It is extremely radioactive and can only be created in a laboratory. The most stable known isotope, roentgenium-282, has a half-life of 120 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. Only a few roentgenium atoms have ever been synthesized, and they have no practical application.
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. Roentgenium is thought to be a solid at room temperature and to have a metallic appearance in its regular state.
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Roentgenium (German: [ʁœntˈɡeːni̯ʊm] ) is a synthetic chemical element; it has symbol Rg and atomic number 111. It is extremely radioactive and can only...
Roentgenium (111Rg) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes...
silver (Ag), gold (Au), and roentgenium (Rg), although no chemical experiments have yet been carried out to confirm that roentgenium behaves like the heavier...
of highways numbered 111 1/11 (disambiguation) 11/1 (disambiguation) Roentgenium, synthetic chemical element with atomic number 111 This disambiguation...
for the co-discoveries of elements 110, 111, and 112 (darmstadtium, roentgenium and copernicium). Ninov also claimed the creation of elements 116 and...
created by a German team: bohrium, hassium, meitnerium, darmstadtium, roentgenium, and copernicium. Element 113, nihonium, was created by a Japanese team;...
classified under E111 in the European Union The DB Class 111 locomotive Roentgenium, element 111 in the periodic table This disambiguation page lists articles...
is significantly smaller than the values predicted for darmstadtium, roentgenium, and copernicium, although it is greater than that predicted for flerovium...
number 111, a synthetic transuranium element. This element was named roentgenium (Rg) in November 2004. Chemistry portal International Union of Pure and...
GSI had been the first to convincingly synthesize the element. 111. roentgenium, Rg, named after Wilhelm Conrad Röntgen, discoverer of X-rays (1994)...
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