Noble Gas That Might Scare Superman
This page is the CodyCross answer for the clue below from Small World, Group 690, Puzzle 2 (Protons and Neutrons).
Question is: Noble Gas That Might Scare Superman
and the answer is: KRYPTON
Word Meaning:
KRYPTON — (uncountable) The chemical element (symbol Kr) with an atomic number of 36. It is a colourless, odourless noble gas that only reacts with fluorine. It is one of the rarest gases in the Earth's atmosphere.
Definitions from Wiktionary.