Flerovium (Fl)

Unknown

Flerovium is a superheavy element predicted to be a noble-gas-like volatile metal due to relativistic effects, and with [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p², flerovium (half-life 2.6 seconds for Fl-289) has a closed-shell-like electron configuration. Relativistic stabilization of the 7p₁/₂ subshell makes it behave unlike lead.

Key metrics

Density14g/cm³predicted

Melting point340Kpredicted

Boiling point210Kpredicted

Electronegativity2Paulingpredicted

Discovery

1998discovered

Discovered by: Joint Institute for Nuclear Research
Reactivity profile: Possibly noble-gas-like
Reactivity: Low
Bonding: Metallic

Electron configuration

\textcolor{#6b7280}{[Rn]}\; \textcolor{#a855f7}{5_{f}^{14}}\; \textcolor{#22c55e}{6_{d}^{10}}\; \textcolor{#ef4444}{7_{s}^{2}}\; \textcolor{#3b82f6}{7_{p}^{2}}

[Rn] 5f14 6d10 7s2 7p2

Wave function

\Psi_{\text{Fl}} \approx \frac{1}{\sqrt{114!}} \det \left| \chi_1(\mathbf{r}_1) \dots \chi_{114}(\mathbf{r}_{114}) \right|

Probability density $|\Psi|^2$ across the Fl valence shell.

Crystal structure

Face-Centered Cubic

Lattice constantsa = 1.00

Cell anglesα = β = γ = 90°

Coordination number12

Atoms per cell4

Atomic packing factor0.74

Physical properties

Atomic radius: 143 pmpredicted
Ionization energy: 800 kJ/molpredicted
Electron affinity: 0 kJ/molpredicted
Crystal structure: Face-centered cubic (predicted)

Oxidation statespredicted

+2+4

Acid/base

Neutral

Strongly acidicStrongly basic

State at 25 °CGas

340 K210 K298 K

predicted