Understanding the scientific rationale behind Strontium's position in the periodic table:
Belongs to Group 2 because it has 2 valence electrons in its outer 5s orbital (5s²).
Belongs to Period 5 because its outermost electrons occupy principal shell n=5.
Belongs to the s-block because the differentiating electrons enter the 5s subshell.
Classified as an alkaline earth metal due to basic oxide formation and stable +2 oxidation states.
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: 2.
Found primarily in celestite (SrSO₄) and strontianite (SrCO₃) mineral ores.
Named after the village of Strontian in the Scottish Highlands
Stable natural strontium is non-toxic, but radioactive Strontium-90 causes bone leukemia and osteosarcoma.