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The only one which is a liquid at room temperature
The only one whose name contains a character from the title of a Shakespeare play
The only one with a single-letter chemical symbol
The only one whose chemical symbol is an acceptable word in Scrabble
The only one whose chemical symbol is exclusively made up of vowels
The only one whose name begins with its chemical symbol
The only one which is a noble gas
The only one which is a halogen
The only one with an atomic number greater than 100
The only one whose name contains a double letter
The only one named after a woman
The only one whose name contains the same two-letter sequence twice