Roentgenium Rg (Element 111) of periodic table

111 Rg (Roentgenium)

Appearance – Silvery (Highly radioactive)

Mass number – 282

Atomic weight – 281.1684 g/mol

Atomic number (Z) – 111

Electrons: 111

Protons: 111

Neutrons: 170

Group – 11

Period – 7

Block – d

Element category – Transition metal

Electrons per shell – K2, L8, M18, N32, O32, P17, Q2

Electron configuration – 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s²6p⁶5f¹⁴6d⁹7s²

Phase – Solid

Density – 28.7 g/cm³

Half life(s) – 600

Lifetime(s) – 870

Oxidation states – 5, 3, 1, -1

Ionization energies – 1st: 1022.7 kJ/mol, 2nd: 2074.4 kJ/mol, 3rd: 3077.9 kJ/mol

Atomic radius – 138 pm

Covalent radius – 121 pm

Crystal structure – Body-centered cubic

CAS Number – 54386-24-2

Naming – After Wilhelm Rontgen

Discovery – GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany (1994)

Isotopes – 286_Rg 283_Rg 282_Rg 281_Rg 280_Rg 279_Rg

Uses – At present, it is only used in research.

Natural abundance – It is made by fusing nickel and bismuth atoms in a heavy ion accelerator

#Roentgenium

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