Flerovium (Fl) — element 114post-transition metal · group 14, period 7
Flerovium is a chemical element with the symbol Fl and atomic number 114. It is a post-transition metal in group 14, period 7 of the periodic table (the p-block), with a standard atomic mass of [289] u. At room temperature (25 °C) flerovium is predicted to be a liquid.
# Flerovium properties
| Symbol | Fl |
|---|---|
| Atomic number | 114 |
| Atomic mass | [289] u |
| Category | post-transition metal |
| Group | 14 |
| Period | 7 |
| Block | p-block |
| Electron configuration | [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p² |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p² |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 4 |
| Protons / electrons | 114 / 114 |
| State at 25 °C | predicted liquid |
| Melting point | 200 K (-73.1 °C, -99.7 °F) (predicted) |
| Boiling point | 380 K (106.9 °C, 224.3 °F) (predicted) |
| Density | 14 g/cm³ (predicted) |
| Electronegativity (Pauling) | — |
| First ionization energy | — |
| Atomic radius | — |
| Discovered | 1998 |
Values for superheavy elements are theoretical predictions; none have been measured in bulk.
# Electron configuration of flerovium
The electron configuration of flerovium is [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p², written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d¹⁰ 7s² 7p². Its 114 electrons fill 7 shells as 2, 8, 18, 32, 32, 18, 4, so the outermost shell holds 4 electrons. As a group 14 element, flerovium has 4 valence electrons. Because only a few atoms have ever been made, this configuration is a theoretical prediction.