Examlex
Which of the following is a stock concept?
Atoms
The smallest units of matter that form chemical elements, consisting of a nucleus surrounded by electrons.
Potassium
A chemical element with the symbol K, atomic number 19, and one of the alkali metals, essential for living organisms.
Electrons
Subatomic particles with a negative electric charge, found in electron shells around an atom's nucleus.
Neutral Atoms
Atoms with an equal number of protons and electrons, resulting in no overall electric charge.
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