Uranium-238 decays into thorium-234.

How do scientists explain why this happens?

A) The nucleus is unstable.

B) The atom is unstable.

C) It is bombarded by alpha particles.

D) It is bombarded by neutrons.

1 answer

A) The nucleus is unstable.

In this case, the uranium-238 nucleus is unstable and undergoes radioactive decay to become a more stable thorium-234 nucleus. This process helps to explain why uranium-238 decays into thorium-234.