Roentgenium (Rg)
Roentgenium
Roentgenium (Rg) is an element with unknown chemical properties in period 7, group 11. Its relative atomic mass is [282] and the molar mass of the atom is [282] g/mol.
Atomic number 111
Atomic mass [282] predicted
Molar mass [282] g/mol
Category Unknown properties Unknown
Properties of roentgenium
| Atomic number | 111 |
|---|---|
| Symbol | Rg |
| Latin name | Roentgenium |
| Relative atomic mass | [282] |
| Molar mass | [282] g/mol |
| Group, period, block | 11, 7, d |
| Category | Unknown properties |
| State at 20 °C | Unknown |
| Electron configuration | [Rn] 5f¹⁴ 6d⁹ 7s² |
Electron configuration of roentgenium
Electrons per shell
K2L8M18N32O32P17Q2
Full notation
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁹ 7s²
Noble-gas notation
111 protons · 111 electrons[Rn] 5f¹⁴ 6d⁹ 7s²
Formula and compounds of roentgenium
Simple substanceRgroentgeniumMolar mass of Rg: [282] g/mol
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Frequently asked questions
The relative atomic mass of roentgenium is [282], so the molar mass of the atom is [282] g/mol.
Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁹ 7s². Noble-gas notation: [Rn] 5f¹⁴ 6d⁹ 7s².