The process of radioactive decay is unpredictable and irreversible. Which option would be an appropriate model of the radioactive decay of a group of atoms?

The most appropriate model of the radioactive decay of a group of atoms from the given options would be popping a bag of popcorn.

Here's why:

• Unpredictability: Just like when you heat a bag of popcorn, you cannot predict exactly when each kernel will pop, which aligns with the unpredictable nature of radioactive decay.

• Irreversibility: Once a kernel of popcorn has popped, it cannot return to its original state, similar to how radioactive decay is an irreversible process.

The other options do not effectively capture the random and irreversible nature of radioactive decay.