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 term may also be applied to exploitation of Native American reservations, where differing environment regulations allow the land to be more easily used for dump sites. It is important to distinguish the difference between toxic colonialism and environmental racism. Toxic colonialism is the practice of targeting poor communities of color in developing nations for waste disposal and/or experimentation with risky technologies. Environmental racism is the inequitable distribution of environmental hazards based on race. In other words, toxic colonialism can be seen as “micro” as it focuses on a specific area or group of people. Environmental racism can be seen as