what is the expression of the chemical composition of a compound?\no electron arrangement\no chemical…

Brief Explanations:

A chemical formula represents the chemical composition of a compound, showing the types and relative numbers of atoms present. Electron - arrangement describes how electrons are distributed in an atom or molecule. Bond - arrangement refers to how atoms are bonded to each other. There is no such thing as "element formula" in the context of representing compound composition.

Answer:

B. chemical formula