This is super clever. I like the play on the periodic table, and even more impressed that you thought out of the box on it. I love that it is clean, and simple and modern. I may ask for a couple of changes but will get back with you after deliberating with the client.
The client is being slow to response, but has mentioned specifically that he likes the font you used. He is debating with a more heavy font or a lighter font like you used. If your logo is chosen, would you provide the font? He would like to stick to a general style guide and font treatment when doing his brochures and whatnot.
If you can't provide us with the font, can you tell us the name of the font so we can buy it?
Also, can you give us a revision with green instead of red? The client really likes the green motif so far.
I can't provide revisions right now because of where we are in the judging process. I believe only the first ranked designer has the ability to submit entries at this time.