Multiple choice

Which of the following is a result of an alpha emission from a radioactive element?

  1. The atomic number of the daughter element is increaseed by 2.

  2. The atomic number of the daughter element is decreased by 2.

  3. The mass number of the daughter element is increased by 4.

  4. Atomic number of daughter element is increased by 2, and mass number is increased by 4.

  5. Atomic number of daughter element is decreased by 2, and mass number is decreased by 4.
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E Correct answer
Explanation

When an alpha particle comes out of the nucleus of a radioactive element, the atomic number and the mass number decrease by 2 and 4, respectively.

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