Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics Tha major
stable isotope ofcalcium , 4020Ca, having twentyprotons and twentyneutrons ; it amounts to almost 97% of theelement innature
Etymologies
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Examples
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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).
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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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).
THE GREATEST SHOW ON EARTH RICHARD DAWKINS 2009
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