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.

Ununennium, also known [8] as eka-francium or element 119, is a hypothetical chemical element; it has symbol Uue and atomic number 119. Ununennium and Uue are the temporary systematic IUPAC name and symbol respectively, which are used until the element has been discovered, confirmed, and a permanent name is decided upon.

A synthetic radioactive element, roentgenium (pronounced as runt-GEN-ee-əm), also known as unununium, is denoted by the symbol Rg [1, 2]. It is not found naturally and is only produced in the lab under controlled circumstances.

Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page Basic Information Name: Unununium Symbol: Uuu Atomic Number: 111 Atomic Mass: (272.0) amu Melting Point: Unknown Boiling Point: Unknown Number of Protons/Electrons: 111 Number of Neutrons: 161 Classification: Transition Metal Crystal Structure: Unknown Density ...

2020年1月24日 · However, in 1979 the IUPAC recommended systematic placeholder names be given to unverified elements, so until the permanent name was decided, element 111 was called unununium (Uuu).

The discovery of this new element was first announced in a paper published early in 1995. It was given a temporary name of unununium, derived from its atomic number, and the symbol Uuu.

Ununium or unununium was a temporary name given to the man made element number 111. Un means one so the original name meant one-one-one. It is found within group 11, period 7 and block d of the periodic table of elements. This element has now been re-named roentgenium in honor of the famous scientist Wilhelm Conrad Roentgen.

roentgenium (Rg), artificially produced transuranium element of atomic number 111. In 1994 scientists at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung [GSI]) in Darmstadt, Ger., formed atoms of element 111 when atoms of bismuth -209 were bombarded with atoms of nickel -62.

2023年9月20日 · The IUPAC called it unununium (Uuu), which is the placeholder name corresponding to the atomic number. Since basically no one could consistently spell or …

2018年8月21日 · Taye Demissie relates unununium’s unusually smooth route to roentgenium, and how predicting its properties relies on relativistic calculations.