___________is a non metal exist as a liquid at room temperature.
Bromine
Mercury
Neon
Arsenic
The ratio of atomic mass by the gain of electron of an atom of carbon is known as ___________of that element.
volume
Total mass
Density
Relative atomic mass
___________are pure substances composed of two or more elements.
Atoms
Molecules
Compounds
Mixtures
Pure substances are ___________material.
Impure
Homogeneous
Heterogeneous