Answer:

gaseous

Answer	Crossword Clue
GASEOUS	Like neon
GASEOUS	Neither solid nor liquid
GASEOUS	Like helium

GASEOUS	Like neon or nitrogen
GASEOUS	Tenuous.
GASEOUS	Describing a comet's tail.
GASEOUS	Lacking substance.
GASEOUS	In the form of vapor.
GASEOUS	Like certain elements.
GASEOUS	Tenuous
GASEOUS	Not solid or liquid

GASEOUS	Like hydrogen and chlorine
GASEOUS	Like four of the eight planets
GASEOUS	Like nitrogen and neon
GASEOUS	Like krypton