The distinctive yellow-green colour of this chlorine sample is clearly apparent. The gas is permanently sealed inside a dry glass sphere. Chlorine is a reactive member of the halogen family, widely used in the chemical industry.
Bromine is one of only three elements that are liquid at room temperature (or at least body temperature in the case of caesium). Bromine is also unpleasantly corrosive and remarkably difficult to contain. This sample is safely imprisoned in an acrylic block.
