Question

complete the sentence by using word ion, molecule, atom or element.
a(n)______ is the smallest particle of a covalent compound that still has the properties of the compound.
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Explanation:

A molecule is the smallest particle of a covalent compound that retains its properties. Atoms are smaller but don't have compound - specific properties. Ions are charged and not relevant here. An element is a pure substance, not a particle of a compound.

Answer:

molecule