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Middle schoolers are like atoms
Some compounds are big and full of kids, and some are small, just two or three. The big ones are often the most unstable. A group of four kids who like each other has found a stability that depends on it staying exactly those four.
That explains the most confusing part for the free-floating atom. Each of the four may be kind to that kid alone, on a weekend or in the seat next to hers in class. Together, they won't welcome any atom that could threaten the chemistry they have, so one kid sees friendly faces individually and a closed door as a group.
Hearing it this way makes it feel less personal. The mixed messages make sense, and options open up: some kids move on, find another free-floating atom, or join a compound that is still taking atoms. Kids who get the metaphor come up with plenty of solutions on their own.
Why do atoms bond in the first place?
Atoms bond because sharing or trading outer electrons leaves them in a lower energy state than sitting alone. Sodium gives up an electron and chlorine takes it, which is how table salt forms. Helium and neon already have full outer shells, so they almost never bond with anything.
Why do groups of three split so often?
The sociologist Georg Simmel wrote in the early 1900s that a pair and a trio behave very differently. In a pair, each person depends entirely on the other. Add a third person and any two can line up against the one left out. Simmel's essays on pairs and trios remain standard reading in sociology.
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