Places de ellol parent (d) two piilos usuv put.7. The time required for 99.9% disintegration of every radio element is nearly

Places de ellol parent (d) two piilos usuv put.7. The time required

1.	Places de ellol parent (d) two piilos usuv put.7. The time required for 99.9% disintegration of every radio element is nearly
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