Understanding the scientific rationale behind Iron's position in the periodic table:
Belongs to Group 8 because it has 8 valence electrons (3d⁶ 4s²).
Belongs to Period 4 because its outermost electrons occupy n=4.
Belongs to the d-block because its differentiating electrons enter 3d orbitals.
Classified as a transition metal with hallmark ferromagnetism and catalytic properties.
Hover or tap any shell orbit ring to inspect electron counts and 2n² capacities.
Educational Note: This Niels Bohr planetary model visually illustrates principal quantum energy shells ($n=1, 2, 3\dots$) and electron counts. In modern quantum mechanics (Schrödinger model), electrons do not orbit in fixed circular planetary tracks, but exist as 3D probability clouds (orbitals: $s, p, d, f$) governed by the Heisenberg uncertainty principle.
Neutral ground state configuration. Valence electrons: 8.
Fourth most abundant element in Earth's crust (5.6%) and the primary constituent of Earth's outer and inner liquid/solid core; mined as hematite (Fe₂O₃) and magnetite (Fe₃O₄).
From Proto-Germanic 'isarnan'; symbol Fe from Latin 'ferrum'
Elemental iron is generally non-toxic and essential for human life, but iron overdose is a leading cause of accidental poisoning in young children.