Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Tha major stable isotope of calcium, 4020Ca, having twenty protons and twenty neutrons; it amounts to almost 97% of the element in nature

Etymologies

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Examples

  • It is often called the potassium argon clock, because argon-40 (one lower in the periodic table) is one of the elements to which potassium-40 decays (the other, resulting from a different kind of radioactive decay, is calcium-40, one higher in the periodic table).

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