Word.ws English Dictionary

potassium-40

potassium-40 noun: a naturally-occurring radioactive isotope of potassium, 4019K, having 19 protons and 21 neutrons, and a half-life of 1.3 billion years; it is the chief source of natural radioactivity in living tissue.

Noun

potassium-40 (uncountable)

  1. A naturally-occurring radioactive isotope of potassium, 4019K, having 19 protons and 21 neutrons, and a half-life of 1.3 billion years; it is the chief source of natural radioactivity in living tissue

Questions about potassium-40

What does potassium-40 mean?
Potassium-40 means a naturally-occurring radioactive isotope of potassium, 4019K, having 19 protons and 21 neutrons, and a half-life of 1.3 billion years; it is the chief source of natural radioactivity in living tissue.
What part of speech is potassium-40?
Potassium-40 is a noun.

Words near potassium-40 in the dictionary

  1. potassium sulfate
  2. potassium sulfite
  3. potassium sulphate
  4. potassium sulphite
  5. potassium-39
  6. potassium-40
  7. potassium-42
  8. potassium-43
  9. potassium-argon dating
  10. potassium-argon datings
  11. potassiumlike

Source and license

Adapted from Wiktionary: potassium-40 (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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