Question

B)2.) For the 4 atoms below, choose "stable" or "unstable" to describe the nucleus. (4 points)(4 points)
Stable nucleus Unstable nucleus
Helium-4


Uranium-238


Thallium-216


Radon-219
D)4.) 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
E)5.) When uranium-235 undergoes the type of decay in question #4 above, what is the new atom produced? (1 point)(1 point)
Responses

neptunium-235
neptunium-235

Uranium-231
Uranium-231

protactinium-235
protactinium-235

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

alpha and beta minus
alpha and beta minus

beta minus and beta plus
beta minus and beta plus

alpha and beta plus
alpha and beta plus
G)7.) Of the two types of nuclear decay Thorium-231 can undergo in question #6 above, which type will make the nucleus MORE stable?(1 point)
Responses

both types of decay offer equal stability
both types of decay offer equal stability

beta minus
beta minus

alpha

Answer 1

Here are the answers to your questions based on the provided information:

**B)2. Nuclear Stability of Atoms:**
- Helium-4: **Stable nucleus**
- Uranium-238: **Unstable nucleus**
- Thallium-216: **Unstable nucleus**
- Radon-219: **Unstable nucleus**

**D)4. Nuclear Decay of Uranium-235:**
Uranium-235 will primarily undergo **alpha decay**.

**E)5. New Atom Produced from Uranium-235 Decay:**
The new atom produced when Uranium-235 undergoes alpha decay is **Thorium-231**.

**F)6. Types of Nuclear Decay for Thorium-231:**
Thorium-231 can undergo **alpha and beta minus** decay.

**G)7. Type of Decay Making Thorium-231 More Stable:**
**Alpha decay** generally leads to a more stable nucleus compared to beta decay, so the answer is **alpha**.

If you have any more questions or need further clarification, feel free to ask!