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Which of the following statements are true about nuclear decays and radioactivity?

1. Gamma decay involves emission of a 4He nucleus A: True B: False

2. A neutrino is a particle with a negative charge and a very small mass A: True B: False

3. The mass of a radioactive nucleus before decay is greater than the total mass of the decay products A: True B: False

4. Alpha decay involves emission of a 4He nucleus A: True B: False

5. Beta decay involves emission of an electron A: True B: False

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