All known calcium isotopes (from Ca-34 to Ca-58)
Calcium has a lot of isotopes, many of which are radioactive and obtained artificially.
5 isotopes are stable and found in nature.
Calcium-40 is the most common calcium isotope its retention from total calcium is 96%.
The longest-lived radioactive calcium isotope is calcium-48, which has a half-life of 6.4 billion billion years, but many radioactive isotopes calcium have a half-life of less than 1 second
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