sorry, I don't understand what you mean by "formula that is in these elements". Are you trying to construct a formula using those elements? Or something completely different.
Hmm. It's quite common to append the year of one's birth on a username on AB and elsewhere. If Lindsay was really born in 1983, she's a bit old at 26 to be in school. What else could the 1983 be?
Chamois makes a good point. I'd also like to add that it seems unlikely that someone born in 1983 would have a child of an age old enough to ask a question of this complexity. The plot thickens!
OMG factor30, I hadn't thought of that! Come to think of it, given the chemistry results at my local comprehensive this year, I think I know exactly where she teaches!