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111 Rg Roentgenium 282

Roentgenium

UNKNOWN, PROBABLY TRANSITION METAL
Bohr Model: Electrons arranged in energy shells around the nucleus.

Roentgenium 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.

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Quick Facts

Atomic Number 111
Period 7
Group 11
Phase Solid
Appearance Unknown
About Unknown, Probably Transition Metals

Transition metals are elements with partially filled d-orbitals. They are hard, have high melting points, and often form colored compounds.

History

Discovered By Gesellschaft für Schwerionenforschung
Named By Unknown

Physical Properties

Atomic Mass 282
Density 28.7 g/L
Molar Heat N/A J/(mol·K)
Phase Transition (Melting & Boiling Points)

Roentgenium phase transition data is unavailable.

Atomic Properties

Electron Config *[Rn] 5f14 6d10 7s1
Electronegativity N/A
Electron Affinity 151 kJ/mol
Ionization Energy N/A kJ/mol
Orbital Filling Diagram
This diagram visualizes electron configuration according to the Aufbau principle and Hund's rule. Boxes represent orbitals (s, p, d, f), while arrows indicate electrons with spin up or down. Electrons fill lower energy levels first and occupy orbitals singly before pairing.

Photograph

Image of Roentgenium Source: Wikipedia

External Resources

Wikipedia PubChem Royal Society of Chemistry Periodic Videos (YouTube)

Study Guide

Atomic Number

The number of protons in the nucleus, which defines the element.

Atomic Mass

The average mass of an atom, including protons and neutrons.

Electronegativity

A measure of how strongly an atom attracts electrons in a bond.

Ionization Energy

The energy required to remove an electron from an atom.

Electron Config

The arrangement of electrons in the atom's energy shells.