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Dmitri Mendeleev

Dmitri Mendeleev (1834–1907) was a Russian chemist who established a systematic periodic table in 1869 by arranging elements according to atomic weight and chemical properties, leaving intentional gaps to predict undiscovered elements.

Why it matters

Mendeleev's periodic system provided a coherent organizational structure for chemistry, transitioning the field toward systematic classification. The subsequent discovery of elements matching his predicted properties offered substantial empirical validation for the periodic law.

What it builds on

• Periodic Law

Related concepts

• Inorganic ChemistryappliedMendeleev's periodic table organized inorganic chemistry's vast diversity into systematic patterns of oxidation states, bonding, and reactivity
• Scientific MethodhistoricalMendeleev's successful predictions of undiscovered elements demonstrated the power of classification and pattern recognition as scientific methodology
• Quantum MechanicsconceptualQuantum mechanics later explained why periodicity exists: electron shell structure and quantum numbers determine the periodic table's shape

Appears in Wonders

• The Atom