Answer
a. gas
b. gas
c. solid
Work Step by Step
a. Gases do not have definitive shapes or volumes. As the gas in a scuba tank breathing mixture does not have a definite shape or volume, it should be classified as a gas.
b. Neon atoms are gaseous because they do not interact with each other and do not have shape or volume.
c. The particles in an ice cube have definite shape and volume. Also, their particles are held together in a rigid structure. As such, ice cubes are solid.
