A diradical is like a molecule with two parts that are not happy being together. It's like having two magnets that don't want to stick together because they have the same side facing each other.
Imagine the molecule as a person who wants to be balanced. They want to have an even number of electrons in each part, but sometimes they end up with an odd number of electrons. This makes them feel unbalanced, like they're missing something or have too much of something.
When a molecule becomes a diradical, it means that it has two lonely, unpaired electrons. These lonely electrons cause the molecule to be unstable and reactive, kind of like a really grumpy person who is always looking for a fight.
Scientists have been studying diradicals for a long time because they are really important in chemistry. They can help create new materials and help us understand how reactions work. But they can also be dangerous because they can cause explosions or fires if they react too much.
So, to sum it up, a diradical is like a molecule with two parts that don't want to be together because they have too many or too few electrons. It's unstable and reactive, and scientists study it to learn more about chemistry.