10. An isotope of cesium (cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period o

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10 An Isotope Of Cesium Cesium 137 Has A Half Life Of 30 Years If 1 0 Mg Of Cesium 137 Disintegrates Over A Period O 1 (36.38 KiB) Viewed 46 times

10. An isotope of cesium (cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 11. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.50 g? 12. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 13. A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 28 years. In what year will only 0.625 grams of this strontium-90 remain?