Is the letter sign required for single letter elemental symbols that have a sub- or super-script attached? (e.g. N<sup>3-</sup>, S<sup>2-</sup>, K<sup>+</sup>, O<sub>2</sub>, or F<sub>2</sub>)
How about when a single letter elemental symbol is next to a sign of comparison in an equation? (e.g. 3 mol O = 3x16.00 g = 48.00 g O)
Nothing can be found with the reference material the shop has on hand.
Consensus in both cases is: “Yes, the letter sign would be required.” The reasoning is that the elemental symbols would be treated the same as abbreviations rather than variables in these cases. The letters cannot be replaced with numbers to solve the problem and the letter sign IS required for abbreviations in situations such as these.
Thank you again for your assistance,