I think that was radium. Tritium doesnâ(TM)t glow except in the little glass tubes coated with phosphorus

They did. Some students could submit one question but not the other for various reasons: submit button didnâ(TM)t work, file type said it was wrong though the same as the other question, slow submission until time was up. Some students thought it was fine and then got an email that their upload was corrupted.

There wasnâ(TM)t a multiple choice section this year