Thanks for that, but I’m now even more confused. I thought that the He came from the Hotel clue, which I can’t get, or the More clue, again which I can’t get. Can I assume then that my Ra would be Rn? Where then does the Kr come from? Chemistry and science has always been gobbledygook to me. I think that leaves me with Ar and Kr, which are the only letters that I can see that would fit in the final 2 words, 3rd and 6th, is that correct?