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 tort and residents. Thousands of toxic chemicals are used in industry and workers in these areas can experience a variety of toxic injuries. Unlike the general population, which is exposed to trace amounts of thousands of different chemicals in the environment, industrial workers may be regularly exposed to much higher levels of chemicals and therefore have a greater risk of developing disease from particular chemical exposures than the general population. An occupational toxic injury case may result in a workers' compensation claim, which is made against the worker's employer. The same injury can potentially support a toxic tort case against "third