I’m neither a star nor a planet
But my subordinates surround me
They keep my sanity in check
If more were to join, I become pessimistic
If some were to leave I‘m overly optimistic
Who am I? Who are my subordinates?
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The nucleus of an atom.
Your subordinates are:
The stability (sanity) of atoms depends on whether or not their outer-most shell is filled with electrons. Credit - marcellothearcane, in comments.
If more were to join:
You would be negative.
If some were to leave:
You would be positive.