Atomic Structure
Atomic structure is the arrangement of tiny particles inside an atom, which you can model by grouping dried beans into a center cluster and an outer ring.
Think of it this way
An atom works like a bowl of mixed beans. The heavy kidney beans clump together in the center, forming the nucleus. The smaller lentils float in a loose ring around the outside, like electrons in their shell.
Explaining atomic structure by grade level
Picture a handful of dried beans on a table. Push most of them into a tight pile in the middle. That pile is like the center of an atom. Now place a few beans in a circle around the pile. Those outer beans move around the center, the way every tiny piece of matter is built.