The smallest unit of a compound is called a(n)
a ion
b molecule
c isotope

b molecule

Explanation:

A compound is the union or two or more elements. Elements are formed by atoms, so the smallest amount of a compound is the union of two atoms from different elements; in other words a molecule. A molecule is the smallest part of a compound that can't be separated using chemical processes.

We can conclude that the smallest unit of a compound is called a molecule.

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i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

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current flows in a wire