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kiannasmith46
19.12.2019 •
Chemistry
Which produces barium-137 when it undergoes gamma decay? a. cesium-137 b. cesium-138 c. barium-137 d. barium-138
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Ответ:
C. Barium-137
Explanation:We have barium-137
Required to identify the radioisotope that undergoes gamma decay to produce Ba-137.We need to know that when a radioisotope undergoes gamma decay its mass number and the atomic number remains unchanged.
The atomic number of Ba-137 is 56 while the mass number is 137.We need to identify the choice whose atomic number is 56 and mass number is 137.In this case,
Cesium-137 has a mass number 137 and atomic number 55Cesium-138 has a mass number 138 and atomic number 55Barium-137, has a mass number, 137 and atomic number 56.Barium-138 has a mass number 138 and atomic number 56Therefore the correct choice is C. Barium-137
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