Neon is a ______________gas.
Monoatomic
Diatomic
Triatomic
Polyatomic
Hydrogen is a __________gas.
The negatively charged ions are called
Atoms
Molecules
Anions
Cations
Impure substances are
Homogeneous
Pure
Elements
Mixtures
____________is a polyatomic gas.
Hydrogen
Helium
Neon
Ozone
____________is the smallest particle of a substance that can normally exist separately.
A mixture of sand and water can be separated by
