Roentgenium RoentengiumEC.png

Atomic Number: 111

Protons: 111

Electrons: 111

Neutrons: 161

Average Atomic Mass: 272

Isotopes: No common know isotopes

Discovery: Roentgenium was discovered on 8th December 1994 at the GSI in Darmstadt, Germany.

Name: Named after Roentgen, a German chemist and physicist who discovered X-rays during the late 1800s

Uses: No uses for Roentgenium

Interesting Facts: Only a few atoms of this element have been named.