When the nucleus of an atom of uranium-238 emits an alpha particle, the mass number will

Name: When the nucleus of an atom of uranium-238 emits an alpha particle, the mass number will
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Question

Quizplus · Accepted Answer

An alpha particle consists of two protons and two neutrons, so its mass number is 4. When uranium-238 emits an alpha particle, its mass number will decrease by 4 units because the alpha particle is being ejected from the nucleus. Therefore, choice A is correct.

When the Nucleus of an Atom of Uranium-238 Emits an Alpha