also known as



Name Roentgenium
Symbol Rg
Atomic Number 111
Atomic Mass 280
Number of Protons 111
Number of Neutrons 161
Number of Electrons 111
Melting Point Unknown
Boiling Point Unknown
Density Unknown
Normal Phase Solid
Family Transition Metals
Period 7
Cost Unavailable



Origin of Name After Wilhelm Conrad Röntgen, who discovered X-rays
Date and Place of Discovery On December  8, 1994 at the Heavy Ion Research Laboratory in Darmstadt, Germany
Discovered by Team led by S. Hofmann
Common Compounds There are no known compounds.
Interesting facts
Common Uses It has no known uses outside the laboratory.


Photo Courtesy of Chem Society
Chemical Elements

Roentgenium Atomic Structure Elements by Name Elements by Number