Here are the answers to your questions:
2.) For the 4 atoms below, choose "stable" or "unstable" to describe the nucleus.
- Helium-4: Stable
- Uranium-238: Unstable
- Thallium-216: Unstable
- Radon-219: Unstable
3.) For the following reaction, choose the missing particle.
(Since I don't have the specific reaction provided, I can't complete this part. Please provide the reaction information for an accurate answer.)
4.) Uranium-235 has an unstable nucleus. Which type of nuclear decay will Uranium-235 undergo?
- alpha
5.) When uranium-235 undergoes the type of decay in question #4 above, what is the new atom produced?
- Thorium-231
6.) Thorium-231 can undergo two types of nuclear decay. Choose the two types below.
- alpha and beta minus
7.) Of the two types of nuclear decay Thorium-231 can undergo in question #6 above, which type will make the nucleus MORE stable?
- alpha
Feel free to ask if you need further clarification or information!