Mendeleev: the periodic system of elements

What changed

Organized elements by atomic weight and chemical analogy, identified periodic properties and left positions for undiscovered elements.

Scientific scope

Mendeleev's periodic classification of elements in the cited historical work.

Evidence

Original sources and institutional historical accounts support the stated contribution. The reading boundary is recorded at each source; this assessment is not an independent scientific verification.

Contributors

• Dmitri Mendeleev · SCIENCE: Named source contributor to this scoped work; individual labor shares are not measured.

• Mendeleev, On the Relationship of the Properties of the Elements to their Atomic Weights (1869), Carmen Giunta translation of the original German abstract

Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.

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