Mendeleev فارسی

Roentgenium (Rg) – Element 111 of the periodic table

Roentgenium (symbol Rg) is element number 111 of the periodic table and belongs to the “Transition metal” category. Its atomic mass is about 282, and its phase under standard conditions is Solid (a theoretical prediction). This element sits in period 7 and group 11 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 32, 32, 18, 1. The short electron configuration of Roentgenium is [Rn] 5f¹⁴ 6d¹⁰ 7s¹. Known uses of Roentgenium include Scientific research.

View in the interactive periodic tableAsk the AI assistant

Roentgenium is a radioactive, mostly synthetic element; its data may be based on limited experiments or theoretical prediction.

Properties of Roentgenium

Atomic number
111
Chemical symbol
Rg
Atomic mass
282
Category
Transition metal
Period
7
Group
11
Phase
Solid (a theoretical prediction)
Protons
111
Electrons
111
Neutrons (approx.)
171
Electron shells
2, 8, 18, 32, 32, 18, 1
Outer-shell electrons
1
Discovered
GSI Helmholtz Centre for Heavy Ion Research (1994)

Electron configuration of Roentgenium

The electron configuration of Roentgenium (Rg), with 111 electrons, is shown below. The last shell (shell 7) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s¹
Short configuration
[Rn] 5f¹⁴ 6d¹⁰ 7s¹
Last shell
7s¹

This synthetic element’s electron configuration is a theoretical prediction.

What is electron configuration and how is it written?

Electron shells of Roentgenium

Distribution of 111 electrons of Roentgenium across shells K to Q:

  1. K2
  2. L8
  3. M18
  4. N32
  5. O32
  6. P18
  7. Q1

What is a transition metal?

The transition metals are the d-block elements: usually good conductors of heat and electricity, with several oxidation states, and they form colourful compounds and important catalysts.

Uses of Roentgenium

Frequently asked questions about Roentgenium

What is the atomic number of Roentgenium?

The atomic number of Roentgenium (Rg) is 111; that is, every atom of it has 111 protons.

What is the electron configuration of Roentgenium?

The electron configuration of Roentgenium (Rg) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s¹; in short form it is [Rn] 5f¹⁴ 6d¹⁰ 7s¹, and its last shell is 7s¹.

What is the chemical symbol of Roentgenium?

The chemical symbol of Roentgenium is Rg.

Where is Roentgenium located in the periodic table?

Roentgenium is located in period 7 and group 11 and belongs to the “Transition metal” category.

What is the atomic mass of Roentgenium?

The atomic mass of Roentgenium is about 282 (atomic mass units).

What is the phase of Roentgenium under normal conditions?

The phase of Roentgenium under standard conditions is Solid (a theoretical prediction).

What are the uses of Roentgenium?

Uses of Roentgenium include Scientific research.

Who discovered Roentgenium?

Roentgenium was discovered by GSI Helmholtz Centre for Heavy Ion Research in 1994.

Elements in the same category as Roentgenium (Transition metal)

Palladium (Pd)Silver (Ag)Cadmium (Cd)Hafnium (Hf)Tantalum (Ta)Tungsten (W)Rhenium (Re)Osmium (Os)Iridium (Ir)Platinum (Pt)Gold (Au)Mercury (Hg)Rutherfordium (Rf)Dubnium (Db)Seaborgium (Sg)Bohrium (Bh)Hassium (Hs)Meitnerium (Mt)Darmstadtium (Ds)Copernicium (Cn)

See all Transition metals

Roentgenium’s group 11 neighbours

Copper (Cu)Silver (Ag)Gold (Au)

Group 11 of the periodic table