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 injury products, pharmaceuticals and industrial products. Many commonly found natural substances may be toxic. They can be found in our air, water or food supply. The top ten most common environmental toxins are: Avoiding direct exposure to toxins will reduce the risk of toxic injury. For safety reasons, wear personal protective equipment when working near environmental or chemical toxins. Many countries have guides classifying dangerous goods and identifying the risks associated with them, such as Canada's Workplace Hazardous Materials Information System. These guides have been developed to ensure worker safety when handling dangerous chemical toxins. It is also important to maintain