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87.62 ± 0.01 (abridged) [3] view. talk. edit. The alkaline earth metal strontium (38 Sr) has four stable, naturally occurring isotopes: 84 Sr (0.56%), 86 Sr (9.86%), 87 Sr (7.0%) and 88 Sr (82.58%). Its standard atomic weight is 87.62 (1). Only 87 Sr is radiogenic; it is produced by decay from the radioactive alkali metal 87 Rb, which has a ...
half-life. 10 −24 seconds. hydrogen-5. 86 (6) lithium-4. 91 (9) hydrogen-4. 139 (10) nitrogen-10.