Hund's rule

Have you ever played with blocks or Legos? You know how some blocks have magnets inside them and they stick together? This is a lot like electrons in atoms.

Electrons are really tiny things that move around the nucleus (center) of an atom. There are rules that tell us how they move. Hund's rule is one of those rules.

Basically, Hund's rule says that when electrons are filling up empty spaces in an atom, they like to spread out as much as they can before any of them double up in a spot. It's like going to a party - you want to spread out and not be too crowded in one place.

So when electrons move to a new empty spot in an atom, they will sit there alone before they will pair up with another electron. This is how the electrons follow Hund's rule.

Hund's rule is really important because it helps scientists understand how electrons in atoms behave. Without Hund's rule, we wouldn't be able to explain why some atoms have special properties and can do special things!