Discovered By: Sigurd Hofmann
Discovery year: 1994

The following table showing some properties of Roentgenium(Rg):

Table Example
Atomic number 111
Group 11
Period 7
Block d
Electrons 111
Protons 111
Neutrons 170
Atomic weight (281)
Oxidation states n/a
Electrons per shell K2 L8 M18 N32 O32 P18 Q1


Table Example
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10 6p^6 7s^1 5f^14 6d^10
Radioactive Yes
Half life 6*10^2 s
Lifetime 8.7*10^2 s
Decay mode Alpha emission (α-decay)