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A nucleus nXm emits one α-particle and two β-particles. The resulting nucleus is
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m - 6 Z n - 4 -
m - 6 Z n -
m - 4 X n -
m - 4 Y n - 2
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Correct Option: C
When mnX emits one α-particle then its atomic mass decreases by 4 units and atomic number by 2. Therefore, the new nucleus becomes m-4n-2Y . But as it emits two β– particles, its atomic number increases by 2. Thus the resulting nucleus is m-4nX.
