Period 6 element devices though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor of alcohol-filled, galinstan-filled, digital, or thermistor-based instruments. It remains in use in scientific research applications and in amalgam material for dental restoration. It is used in lighting: electricity passed through mercury vapor in a phosphor tube produces short-wave ultraviolet light which then causes the phosphor to fluoresce, making visible light. Thallium is a chemical element with the symbol Tl and atomic number 81. This soft gray other metal resembles tin but discolors when exposed to air. The
Toxic colonialism Toxic colonialism Toxicomania colonialism, or toxic waste colonialism, refers to the practice of exporting hazardous waste from developed countries to underdeveloped ones for disposal. In 1992, 'toxic colonialism' was "a striking phrase coined by Jim Puckett of Greenpeace for the dumping of the industrial wastes of the West on territories of the Third World" The term refers to practices of developed nations who rid themselves of toxic or hazardous waste by shipping it to less developed areas of the world. The affected communities typically lack the resources, knowledge, political organization, or capital to resist the practice. In the US, the