Zero, A trigonal planar molecule requires that there are no lone pairs breaking the molecule's parity. This insure that all three atoms exist on the same plane.
What is a molecule?
A group of two or more atoms held together by tempting forces known as chemical bonds; depending on context, the term may or may not add ions which propitiate this criterion is called molecule.
What is an atom?
The smallest unit of ordinary substance forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms called an atom. Atoms are much small, typically around 100 picometers across.
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