What is a coefficient?

in math it's " a numerical or constant quantity placed before and multiplying the variable in an algebraic expression (e.g. 4 in 4x y)."

In physics " a multiplier or factor that measures some property."

Explanation:

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A coefficient is the number before a variable

Explanation:

A numerical or constant quantity placed before and multiplying the variable in an algebraic expression

neutrons are in the middle of the atom and the electrons, which are much smaller.