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Answer: HELIUM
HELIUM is a crossword puzzle answer that we have spotted 20 times.
Scientific discovery of 1868
Second lightest element
Blimp supply
Contents of party store tanks
Light element, and a hint to how the answers to starred clues have been inflated
Balloon fill
Balloon filler
It can raise your voice
Blimp filler
Party balloon filler
Inert gas
Most difficult gas to liquify
Most difficult gas to liquefy
Atomic number 2
Element #2
Balloon gas
Balloon filler, at times
Dirigible filler
This, on the periodic table
#2 on a table