Question

Activity A: Alpha Decay
Get the Gizmo ready:
Click Reset ().
Check that Alpha decay and Uranium are selected.
Question: How does alpha decay change the nucleus of a radioactive atom?
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Predict: As you observed in the warm-up activity, an alpha particle consists of two protons and two neutrons. How will the emission of an alpha particle affect the following?
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Calculate: Turn on Write equation. What you see is an equation that shows the original uranium atom on the left. The boxes on the right represent the daughter product—the atom produced by radioactive decay—and the emitted alpha particle.
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In the top left box, write the mass number of the daughter product and press “Enter” on your keyboard. What is this number?
Please Help me, I really need to ace this answer.

Answer 1

When uranium nucleus undergoes alpha emission, the mass number of its daughter nucleus decreases by four units while the atomic number of its daughter units decreases by two units.

Alpha particles consists has a mass of four units and a charge of two units. This makes an alpha particle to resemble a helium nucleus. When uranium undergoes alpha decay, the mass number of the daughter nucleus is less than that of the parent nucleus by four units while the atomic number of the daughter nucleus is less than that of the parent nucleus by two units.

When Uranium undergoes alpha decay, the following nuclear reaction takes place as shown; $\frac{238}{92} U -----> \frac{232}{90} Th + \alpha$. Note that alpha emission increases the neutron proton ratio.

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