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प्रश्न
Complete the following nuclear changes:
\[\ce {^238_92 P ->\underset{-}-{Q} + ^4_2He->\underset{-}-{R} + ^0_-1e}\]
उत्तर
\[\ce {^238_92 P -> ^234_90Q + ^4_2He->^234_91{R} + ^0_-1e}\]
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