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16 December, 12:29

If three neutrons are produced when a neutron bombards a U - 235 atom, determine the second fission product isotope when the first fission fragment is (a) xenon-133, (b) barium-144, (c) cesium-143, (d) tellurium-137, and (e) lanthanum-146.

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  1. 16 December, 12:44
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    235 U92 + 1n0 - -> A + B + 3 1n0

    when A =;

    (a) xenon-133

    Mass number of B = 235 + 1 - 133 - 3 = 100

    Atomic number = 92 - 54 = 38

    Element = Sr - Strontium

    (b) barium-144

    Mass number of B = 235 + 1 - 144 - 3 = 89

    Atomic number = 92 - 56 = 36

    Element = Kr - Krypton

    (c) cesium-143

    Mass number of B = 235 + 1 - 143 - 3 = 90

    Atomic number = 92 - 55 = 37

    Element = Rb - Rubidium

    (d) tellurium-137

    Mass number of B = 235 + 1 - 137 - 3 = 96

    Atomic number = 92 - 52 = 40

    Element = Zr - Zirconium

    (e) lanthanum-146

    Mass number of B = 235 + 1 - 146 - 3 = 87

    Atomic number = 92 - 57 = 35

    Element = Br - Bromine
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