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What is the difference between cesium-134 and cesium-137

What is the difference between cesium-134 and cesium-137?

A. Same atomic number, different mass number
B. Different atomic number, same mass number
C. Different atomic number, different mass number,
D. Same atomic number, same mass number




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2 Answers

  1. A. Same atomic number, different mass number

    Atomic number give atoms their identity – same number of protons

    Different mass numbers, number after hyphen tells us their unique cases –>in this case, they are isotopes

  2. The correct answer is:

    A. Same atomic number, different mass number

    Cesium-134 and cesium-137 are isotopes of the element cesium, meaning they have the same atomic number (number of protons) but different mass numbers (total number of protons and neutrons).