Oddo-Harkins rule

proper noun

a rule which states that elements that have an even number of protons in the nucleus are more common than those with an odd number

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Meanings

proper noun
  1. chemistrya rule which states that elements that have an even number of protons in the nucleus are more common than those with an odd number

Origin

First reported by Giuseppe Oddo in 1914 and William Draper Harkins in 1917.

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Cite this entry
APA

Oddo-Harkins rule. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/Oddo-Harkins%20rule

MLA

“Oddo-Harkins rule.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Oddo-Harkins%20rule. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “Oddo-Harkins rule,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/Oddo-Harkins%20rule.

Source: Oddo-Harkins rule on Wiktionary, CC BY-SA 4.0.