They are not isotopes. They are not ions. What are they?
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$\begingroup$ I proposed an edit that removes the filler sentence. Feel free to reject/rollback if the filler sentence is important to the puzzle! $\endgroup$ – Zoir Oct 15 at 8:38
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1$\begingroup$ removing the chemistry tag for the time being, feel free to add it back if needed. thanks and nice riddle! $\endgroup$ – Omega Krypton Oct 15 at 8:46
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Well, not sure if the chemistry tag should be there, as the answer is, as the riddle explains
“Not ions”,
i.e.
NOTIONS
This fits the title as
A notion is an idea.