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This topic has appeared in the trending rankings 1 time(s) in the past year. While it does not trend frequently, its appearance suggests a renewed or concentrated surge of public interest.
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Calcium-40 entered the ranking for the first time today at position #. This is its highest position ever recorded.
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-08-24 and was most recently seen on 2026-08-24.
Calcium (20Ca) has 26 known isotopes, ranging from 35Ca to 60Ca. There are five stable isotopes, plus one isotope (48Ca) with such a long half-life that it is for all practical purposes stable. Two isotopes of calcium, 40Ca and 48Ca, are doubly-magic, making them particularly stable nucliides. Calcium also has a cosmogenic isotope, 41Ca, with half-life 99,400 years. Unlike cosmogenic isotopes produced in the air, 41Ca is produced by neutron activation of solid 40Ca in rock and soil. Most of its production is in the upper meter of the soil column, where the cosmogenic neutron flux is still strong enough. Calcium-41 is also produced during stellar nucleosynthesis and decays to 41K, which can be used to understand formation and mixing between solar system reservoirs. The most stable artificial isotopes are 45Ca with half-life 162.61 days and 47Ca with half-life 4.536 days. All other artificial calcium isotopes have half-lives of minutes or less.
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