 Naturally occurring cadmium is composed of 8 isotopes . Two of them are radioactive , and three are expected to decay but have not done so under laboratory conditions . The two natural radioactive isotopes are 113Cd ( beta decay , half @-@ life is 7 @.@ 7 × 1015 years ) and 116Cd ( two @-@ neutrino double beta decay , half @-@ life is 2 @.@ 9 × 1019 years ) . The other three are 106Cd , 108Cd ( both double electron capture ) , and 114Cd ( double beta decay ) ; only lower limits on these half @-@ lives have been determined . At least three isotopes – 110Cd , 111Cd , and 112Cd – are stable . Among the isotopes that do not occur naturally , the most long @-@ lived are 109Cd with a half @-@ life of 462 @.@ 6 days , and 115Cd with a half @-@ life of 53 @.@ 46 hours . All of the remaining radioactive isotopes have half @-@ lives of less than 2 @.@ 5 hours , and the majority have half @-@ lives of less than 5 minutes . Cadmium has 8 known meta states , with the most stable being 113mCd ( t1 / 2 
 Naturally occurring cadmium is composed of 8 isotopes . Two of them <a href='drop_aux' title='1'><mark>are</mark></a>radioactive , and three are expected to decay but have not done so under laboratory <a href='negative_concord' title='2'><mark>conditions</mark></a> . The two natural radioactive isotopes are 113Cd ( beta decay , half @-@ life is 7 @.@ 7 × 1015 years ) and 116Cd ( two @-@ neutrino double beta decay , half @-@ life <a href='drop_aux' title='3'><mark>is</mark></a>2 @.@ 9 × 1019 years ) . The other three <a href='drop_aux' title='4'><mark>are</mark></a>106Cd , 108Cd ( both double electron capture ) , and 114Cd ( double beta decay ) ; only lower limits on these half @-@ lives <a href='been_done' title='5'><mark>have</mark></a> been determined . At least three isotopes – 110Cd , 111Cd , and 112Cd – <a href='drop_aux' title='6'><mark>are</mark></a>stable . Among the isotopes <a href='null_relcl' title='7'><mark>that</mark></a>do not occur naturally , the most long @-@ lived <a href='drop_aux' title='8'><mark>are</mark></a>109Cd with a half @-@ life of 462 @.@ 6 days , and 115Cd with a half @-@ life of 53 @.@ 46 hours . All of the remaining radioactive isotopes <a href='got' title='9'><mark>have</mark></a> half @-@ lives of less than 2 @.@ 5 hours , and the majority <a href='got' title='10'><mark>have</mark></a> half @-@ lives of less than 5 minutes . Cadmium <a href='got' title='11'><mark>has</mark></a> 8 known meta states , with the most stable being 113mCd ( t1 / 2 
Naturally occurring cadmium is composed of 8 isotopes . Two of them radioactive , and three are expected to decay but have not done so under laboratory no conditions . da 2 natural radioactive isotopes are 113Cd ( beta decay , half @-@ life is 7 @.@ 7 × 1015 years ) and 116Cd ( tw2-@ neutrino double beta decay , half @-@ life 2 @.@ 9 × 1019 years ) . The other three 106Cd , 108Cd ( both double electron capture ) , and 114Cd ( double beta decay ) ; only lower limits on dese half @-@ lives done been determined . At least three isotopes – 110Cd , 111Cd , and 112Cd – stable . Among the isotopes do not occur naturally , tdamost long @-@ lived 109Cd witt a half @-@ life of 462 @.@ 6 days , and 115Cd wid a half @-@ life of 53 @.@ 46 hrs . alll of thdaemaining radioactive isotopes got half @-@ lives of less than 2 @.@ 5 hohrs and the majority got half @-@ lives of less den 5 min . Cadmium got 8 known meta states , with thedast stable bein 113mCd ( t1 / 2