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A nucleus mX emits one α-particle and two β-particles. The resulting nucleus is

1. m-4 Z
2. m-6 Z
3. m-4 n
4. m-2 n

Correct answer: m-4 n

Solution

When a nucleus emits an α-particle, its mass number decreases by 4 and its atomic number decreases by 2. Emission of two β-particles increases the atomic number by 2 without affecting the mass number. Thus, the resulting nucleus has a mass number of m-4 and the same atomic number as the original nucleus, denoted by 'n'.

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