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Smallest particle still characterizing a chemical element. It consists of a small nucleus charged positively, carrying almost all of the atom's mass, with electrons surrounding it. This tag should be applied to questions that specifically concern atoms or their properties. For the charged particles, please use [ions] instead. If your question is specifically about [protons], [neutrons], or [electrons], use those tags instead.

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The proper explanation for the general formula of the DU? [duplicate]

It explains, simply, the unsaturation with the difference in H atoms. … Then I stumbled upon the general formula: $$DU=1+\frac12\sum n_i\left(v_i-2\right)$$ $n_i$ is the number of atoms with valence $v_i$. Can someone explain from where this equation was derived? …