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Suppose that the radioactive isotope 223/87 Fr decays and becomes 223/88 Ra. What was emitted ? 1. A gamma-ray photon 2. An x-ray photon 3.

Suppose that the radioactive isotope 223/87 Fr decays and becomes 223/88 Ra. What was emitted ?

1. A gamma-ray photon

2. An x-ray photon

3. An alpha particle

4. A positron

5. An electron

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