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A system of written symbols used to represent qualities or quantities, elements or molecules, or formulas in general. Usually a notation follows a convention or a guideline, often published by IUPAC-IUPAP. This tag should be used for questions regarding the proper use of a notation or misleading or uncommon notation in the scientific literature. Do not confuse this tag with [tag:nomenclature] or [tag:terminology].

10
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mathematical function, and $\ce{H}$ is not a function. I am aware that this is splitting hairs, but thought was deserving of mention since this has the notation tag. It is specifically pointed out in the …
answered Jan 6 '18 by Linear Christmas
10
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In guidelines published by the International Union of Pure and Applied Physics or IUPAP$^{[1]}$, upright letters are recommended. Whether these letters are capitalised depends on their use. Lowercase …
answered Jan 31 '17 by Linear Christmas
6
votes
1answer
As of recent, I provided an answer to the question Law of mass action & collision theory. Therein I wrote a generic reaction $$\ce{$r_1$R1 + $r_2$R2 + \ldots + $r_n$R_n <=> $p_1$P1 + $p_2$P2 + \ldots …
asked Feb 22 '17 by Linear Christmas
5
votes
The superscript '$3+$' denotes a normalised electric charge. Charges are quantised, that is they take on only certain discrete values. Neutrons do not have a net charge ($q = 0 $). Electrons and p …
answered Jan 6 '18 by Linear Christmas
7
votes
The subscripts that specify orbital axes are written in italic. This is mentioned in ACS style guide.$^{[1]}$ So for instance $$\mathrm{d}_{x^2 - y^2}.$$ Be careful though. Other subscripts for orbi …
answered Feb 21 '17 by Linear Christmas
13
votes
It is probably supposed to be the 'corresponds to' sign[ref, p 105]; in this case simply representing that for every two moles of $\ce{NaOH}$ one mole of $\ce{H2SO4}$ is converted by reaction stoichio …
answered Jan 8 '18 by Linear Christmas
4
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Ancient IUPAC literature The IUPAC Interdivisional Committee on Nomenclature and Symbols states in recommendations from $1979$, Use of Abbreviations in the Chemical Literature, Since the style in …
answered Sep 18 '17 by Linear Christmas