Reactivity & Chemical Bonding
Chemical Behavior & Oxidation States
Francium exhibits chemical reactivity characteristic of the alkali metal family, governed by an electronegativity of 0.7 and standard valence interactions.
Z = 87Alkali Metal
Launch 3D Atom & Orbitals LabFrancium
Fr
Standard Atomic Mass: 223 u
Period 7Group 1S-Block
Chemical Specimen/Fr
Concentric Electron Shells7 Energy Levels
n=1: 2e⁻→
n=2: 8e⁻→
n=3: 18e⁻→
n=4: 32e⁻→
n=5: 18e⁻→
n=6: 8e⁻→
n=7: 1e⁻
Scientific Monograph • Alkali Metal
3D Atom SimulatorFrancium (Fr) Scientific Profile
Francium (Fr) is an element with atomic number 87, classified as a alkali metal. Positioned in Period 7, Group 1, and S-block, its chemical and physical profile is defined by its electron configuration ([Rn]7s¹) and periodic trends.
Interactive Virtual Labs Available for Francium
3D Orbitals & Valence Lab
Simulate concentric quantum energy levels, observe valence electron spins, and examine live atomic clouds in full 3D.
Electronic Configuration Lab
Experiment with Aufbau subshell ordering, explore orbital occupancy, and analyze quantum configuration exceptions.
Electron Config
[Rn]7s¹
Electronegativity
0.7 Pauling
Year Discovered
1939
Orbital Shells
7 Principal Levels
Orbital Block
s-block orbital
Group / Period
G: 1 • P: 7
Technological Utility
Industrial & Energy Applications
Francium is utilized in industrial fabrication, materials engineering, electronic manufacturing, and advanced laboratory research based on its specific thermodynamic properties.
Biological Role
Biomedical Profile & Toxicity
Francium does not play a prominent biological role in human biochemistry, existing primarily as a trace element or mineral component in natural ecosystems.
Geochemistry & Abundance
Cosmic & Terrestrial Occurrence
Elements like Francium are synthesized through stellar nucleosynthesis and supernovae r-processes. On Earth, Francium is concentrated in specific ore deposits or synthesized in nuclear accelerators.
Frequently Asked Questions about Francium
Q
What are the key physical and atomic properties of Francium?
Francium (Fr) has an atomic number of 87 and a standard atomic mass of 223 u. It is positioned in Period 7, Group 1, in the S-block, and is classified within the Alkali Metal category.
Q
What is the electron configuration of Francium?
The ground-state electron configuration of Francium is [Rn]7s¹. Its 87 electrons are distributed across 7 principal energy levels (2, 8, 18, 32, 18, 8, 1).
Q
Why does Francium exhibit an electron configuration exception?
Francium follows standard Aufbau principle orbital filling. Transition metals and heavy elements optimize their shell filling based on subshell exchange energy and electrostatic stability.
Q
What are the primary commercial and laboratory uses of Francium?
Francium is utilized in industrial fabrication, materials engineering, electronic manufacturing, and advanced laboratory research based on its specific thermodynamic properties.