Question

Uranium-235 has an unstable nucleus. Which type of nuclear decay will Uranium-235 undergo? (1 point)(1 point)
Responses

alpha
alpha

beta minus
beta minus

beta plus
beta plus

gamma
gamma
Question 5
5.) When uranium-235 undergoes the type of decay in question #4 above, what is the new atom produced? (1 point)(1 point)
Responses

protactinium-235
protactinium-235

Thorium-231
Thorium-231

Uranium-231
Uranium-231

neptunium-235
neptunium-235
Question 6
6.) Thorium-231 can undergo two types of nuclear decay. Choose the two types below. (1 point)(1 point)
Responses

beta minus and beta plus
beta minus and beta plus

alpha and beta minus
alpha and beta minus

alpha and beta plus
alpha and beta plus
Question 7
7.) Of the two types of nuclear decay Thorium-231 can undergo in question #6 above, which type will make the nucleus MORE stable? Write your answer below.

Answer 1

### Question 4
Uranium-235 has an unstable nucleus. The type of nuclear decay that Uranium-235 will primarily undergo is:

**Alpha decay**

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### Question 5
When uranium-235 undergoes alpha decay, the new atom produced is:

**Thorium-231**

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### Question 6
Thorium-231 can undergo two types of nuclear decay. The two types are:

**Alpha and beta minus**

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### Question 7
Of the two types of nuclear decay Thorium-231 can undergo, the type that will make the nucleus MORE stable is:

**Alpha decay**

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