Roentgenium (Rg): Electron Configuration and Properties
Roentgenium (Rg): Electron Configuration and Properties
Electron configuration [Rn] 7s2 5f14 6d9 · group 11 · period 7 · Ar [282]
Roentgenium data
- Atomic number
- 111
- Relative atomic mass
- [282]
- Group
- 11
- Period
- 7
- Block
- d
- Category
- Transition metal
- Electron configuration
- [Rn] 7s2 5f14 6d9
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d9
- Electrons per shell
- 2, 8, 18, 32, 32, 17, 2 (K L M N O P Q)
- Valence electrons
- 11
- Electronegativity (Pauling)
- no data
- First ionisation energy
- no data
- Atomic radius (van der Waals)
- no data
- State at room temperature
- Solid (predicted)
- Melting point
- no data
- Boiling point
- no data
- Density
- no data
- Common oxidation states
- +5, +3, +1, −1
- Discovered
- 1994
Source: PubChem (NIH, accessed 13 Nov 2026); atomic mass: IUPAC standard atomic weight.
Electron shell diagram
K 2 · L 8 · M 18 · N 32 · O 32 · P 17 · Q 2
Orbital diagram (outer electrons)
About roentgenium
Roentgenium is a chemical element with the symbol Rg and atomic number 111. It is a transition metal in group 11, period 7, d-block. The element was discovered in 1994. It is named after Wilhelm Röntgen, discoverer of X-rays. Its bulk properties have never been measured because only a few atoms have been made; it is expected to be a solid at room temperature.
Roentgenium electron configuration
The electron configuration of roentgenium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d9, or in short [Rn] 7s2 5f14 6d9. Its electrons occupy 7 shells: K = 2, L = 8, M = 18, N = 32, O = 32, P = 17, Q = 2. For transition metals, valence electrons are counted from the 7s and 6d subshells: 2 + 9 = 11, matching group 11. For this superheavy element the configuration is a theoretical prediction.
Filling order: 1s2(2) → 2s2(4) → 2p6(10) → 3s2(12) → 3p6(18) → 4s2(20) → 3d10(30) → 4p6(36) → 5s2(38) → 4d10(48) → 5p6(54) → 6s2(56) → 4f14(70) → 5d10(80) → 6p6(86) → 7s2(88) → 5f14(102) → 6d9(111)
Uses of roentgenium
Roentgenium has no practical use outside research, because it can only be made a few atoms at a time in particle accelerators.
Safety
Only a handful of roentgenium atoms have ever been made and they decay very quickly, so it is never handled in an ordinary laboratory.
Other elements in group 11
Frequently asked questions
What is the electron configuration of roentgenium?
The electron configuration of roentgenium (Rg, atomic number 111) is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d9, or [Rn] 7s2 5f14 6d9 in short. By shell: 2, 8, 18, 32, 32, 17, 2.
How many valence electrons does roentgenium have?
Roentgenium has 11 valence electrons.
Which group and period is roentgenium in?
Roentgenium is in group 11, period 7, d-block.
What is the atomic mass of roentgenium?
Roentgenium has no stable isotope, so the mass number of its longest-lived isotope, [282], is given.
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