Answer: HELIUM

AnswerCrossword Clue
HELIUMGas
heliuma gaseous element
heliumlight, colorless gas
HELIUMIt can raise your voice
HELIUMContents of party store tanks
HELIUMParty balloon filler
HELIUMBlimp supply
HELIUMParty-balloon filler
HELIUMScientific discovery of 1868
HELIUMBalloon filler
HELIUMBalloon gas
HELIUMVery light, inert gas.
HELIUMInert gas.
HELIUMVery light gas.
HELIUM"Ashes" of the sun.
HELIUMVoice-changing gas
HELIUMBlimp filler
HELIUMLight element, and a hint to how the answers to starred clues have been inflated
HELIUMSecond lightest element