FleroviumElectron Configuration, Bohr Model, Valence Electrons & Orbital Diagram

The electron configuration of Flerovium is written as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f¹⁴ 6d¹⁰ 7s² 7p². Applying the Aufbau principle — filling orbitals from lowest to highest energy — plus the Pauli Exclusion Principle and Hund's Rule, we systematically place all 114 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f¹⁴ 6d¹⁰ 7s² 7p². The p-subshell adds three dumbbell-shaped orbitals (p_x, p_y, p_z) that collectively hold up to 6 electrons. In Flerovium, these outermost p-orbitals are the seat of its chemical personality — partially filled, enabling versatile bond formation.

Flerovium follows the standard Aufbau filling order without exception. The noble gas shorthand [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p² replaces the inner-shell electrons with the symbol of the preceding noble gas, highlighting that only the outer electrons — 5f¹⁴ 6d¹⁰ 7s² 7p² — are chemically active. Note: for Period 4+ elements, the 4s orbital fills before 3d per Madelung's rule, even though 3d ends at a lower energy in the final atom.

Shell-by-shell, Flerovium's 114 electrons are distributed as: K-shell (n=1): 2 electrons; L-shell (n=2): 8 electrons; M-shell (n=3): 18 electrons; N-shell (n=4): 32 electrons; O-shell (n=5): 32 electrons; P-shell (n=6): 18 electrons; Q-shell (n=7): 4 electrons. The Q-shell (n=7) is the valence shell, containing 4 electrons.

Chemically, this configuration places Flerovium in Group 14 with oxidation states of 6, 4, 2, 0. This configuration directly predicts Flerovium's bonding mode, reactivity toward oxidizing and reducing agents, and the stoichiometry of its most common compounds.

The SPDF orbital model describes Flerovium's electrons not as planetary orbits but as three-dimensional probability clouds — each orbital a region of space where an electron is most likely to be found. Flerovium's 114 electrons occupy 19 distinct subshells: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 5f¹⁴ 6d¹⁰ 7s² 7p², governed by three quantum mechanical rules.

The Pauli Exclusion Principle ensures no two electrons in Flerovium share the same four quantum numbers (n, l, m_l, m_s). This is why the 1s orbital holds only 2 electrons, the full p-subshell holds 6, d holds 10, and f holds 14. Without this rule, all 114 electrons would collapse into the 1s orbital. Hund's Rule of Maximum Multiplicity is critical in Flerovium's p-subshell: the three p-orbitals (p_x, p_y, p_z) must each receive one electron before any pairing occurs. This minimizes electron-electron repulsion and explains Flerovium's 1 paired and 2 empty p-orbitals.

Following standard orbital filling, Flerovium fills orbitals in the sequence: 1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p → 6s → 4f → 5d → 6p → 7s → 5f → 6d → 7p. The final electron enters the 7p² subshell, making Flerovium a p-block element with 4 valence electrons in Group 14.

The outermost electrons — 7p² — are Flerovium's chemical agents. Understanding the 7p² occupancy — how many electrons, whether paired or unpaired, the orbital shape involved — is the foundation for predicting Flerovium's bonding geometry, oxidation behavior, and compound formation.

Flerovium's chemical reactivity is shaped by three interlocking properties: electronegativity, first ionization energy, and electron affinity (0 eV). Its electronegativity is not measurable (noble gas — no electronegativity scale applies).

Flerovium's ionization energy pattern reflects its block and period positioning, consistent with the expected periodic trend for Post-Transition Metal elements.

In standard chemical conditions, Flerovium forms diverse compounds across multiple oxidation states, consistent with its 4 valence electrons and p-block character.

Placing Flerovium between Nihonium (Z=113) and Moscovium (Z=115) reveals the incremental property changes that make the periodic table a predictive tool.

Nihonium → Flerovium: adding one proton and one electron increases nuclear charge by 1. Valence electrons shift from 3 to 4 (Group 13 → Group 14). . Atomic radius decreases from 170 pm to 165 pm, consistent with increasing nuclear pull across a period.

Flerovium → Moscovium: the additional proton and electron in Moscovium changes the valence electron count from 4 to 5, crossing from Group 14 to Group 15. Both elements share Post-Transition Metal character, with Moscovium exhibiting slightly different electronegativity. These comparisons confirm that Flerovium sits at a well-defined chemical inflection point in the periodic table.