Answer: D - 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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ACT Science Exam Prep

Category - ACT Science

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A species undergoes alpha emission to form ²³⁴Fr. What is this species?

²³⁶Ra
²³⁶Rn
²³⁴Rn
²³⁸Ac
²³⁶Ac

Explanation

Answer: D - 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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