As I understand, if a molecule is cyclic and planar, then every atom in the ring must be $\ce{sp^2}$-hybridized and the molecule must have [4n+2] π electrons, where n∈N (Hückel’s rule).
An article in Chemistry World by Sam Howell ("New rule predicts stabilising aromaticity in open-shell metal clusters", 21 MAY 2019), talks about jellium aromaticity.
image source : https://www.chemistryworld.com/news/new-rule-predicts-stabilising-aromaticity-in-open-shell-metal-clusters/3010515.article
My question is what is jellium aromaticity?
Does it have anything to do with Hückel's rule?
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