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Question
Complete the following nuclear change:
\[\ce{^238_92U -> ^234_90Th}\] + ______ + energy
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Solution
The mass number drops by four and the atomic number drops by two as a result of α emission. Additionally, an α particle is equivalent to a two-proton, two-neutron helium nucleus.
\[\ce {^238_92 U -> ^234_90 Th + \underline{^4_2\ce{He}} + Energy}\]
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