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When a radioactive element emits successively one α-particle and two β-particles, the mass number of the daughter element:

1. is reduced by 4 units
2. remains the same
3. is reduced by 2 units
4. is increased by 2 units

Correct answer: is reduced by 4 units

Solution

Emission of an α-particle reduces the mass number by 4, while β-particle emissions do not affect the mass number. Thus, the mass number decreases by 4 units overall.

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