A species undergoes alpha emission to form 234Fr. What is this species?
  1. 236Ra
  2. 236Rn
  3. 234Rn
  4. 238Ac
  5. 236Ac
Explanation
Answer: 238Ac

An alpha particle consists of two protons and two neutrons, and is given the symbol 4He. According to the law of conservation of mass, the reaction must proceed as follows:

238Ac --> 4He + 234Fr.
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