Atomic Number Ordering
Shows that elements should be ordered by atomic number rather than atomic weight, providing the physical basis of the modern periodic table.
Historical biography archive · Updated 2026-11-03
Henry Gwyn Jeffreys Moseley Biography and Timeline
Follow Henry Gwyn Jeffreys Moseley through 4 dated historical records for Great Britain.
Henry Gwyn Jeffreys Moseley, historical timeline
A chronological timeline drawn from matching World History Database records.
4Distinct records
1 of 1Page
1913–1914Years on this page
1913
Missing Atomic Numbers Identified
Uses X-ray spectra to identify gaps in the sequence of atomic numbers and demonstrates that specific elements remain undiscovered.
Moseley Law
Establishes a precise relationship between characteristic X-ray frequencies and the nuclear charge associated with each element.
1914
Periodic Table Anomalies Resolved
Explains why elements such as tellurium and iodine must be ordered contrary to atomic weight by showing that atomic number is the fundamental organising principle.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.