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In my (rather old) reference, Calcium has isotopes from Ca37 through Ca50.
It has stable isotopes of Ca40, Ca42, Ca43, Ca44, Ca46, and Ca48.
Ca40 is the dominant isotope with 96.94% of the total naturally occurring metal. The average of the natural Ca is 40.08.
Ca42 has a half life of 1.3x105 years, Ca45 has 16.3 days, and Ca47 has 4.5 days.
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14y ago

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