Symbol	Rg
Atomic number	111
Group	11 (Coinage metals)
Period	7
Block	d
Classification	Unknown

Appearance	-
Color	-

Number of protons	111 p+
Number of neutrons	170 n0
Number of electrons	111 e-

From Wikipedia, the free encyclopediaRoentgenium is a chemical element with symbol Rg and atomic number 111. It is an extremely radioactive synthetic element (an 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 2.1 minutes. Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany.

Phase at STP	Solid
Density	28.7 g/cm3
Atomic weight	281 u

Melting point	-
Boiling point	-
Heat of vaporization	-

Electronegativity (Pauling Scale)	-
Electron affinity	151 kJ/mol
Oxidation states	(−1), (+1), (+3), (+5), (+7) (predicted)
Ionization energies	1022.7 kJ/mol 2074.4 kJ/mol 3077.9 kJ/mol 4052.4 kJ/mol 5306.7 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f14 6d9 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d9 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d9 7s2
Electrons per shell	2, 8, 18, 32, 32, 17, 2
Valence electrons
Valency electrons
Bohr model	Figure: Shell diagram of Roentgenium (Rg) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s

Discovery

Gesellschaft für Schwerionenforschung (1994)

CAS Number	54386-24-2
ChemSpider ID	-
EC number	-
PubChem CID Number	135476786