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
Risk and Safety Statements in the course of harmonising classification, labelling and packaging of chemicals by introduction of the UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS). The R/S statement code for fuming hydrochloric acid (37%): The corresponding English language phrases: Dashes separate the phrase numbers. They are not to be confused with range indicators. Slashes indicate fixed combinations of single phrases. More detailed hazard and safety information can be found in the material safety data sheets (MSDS) of a compound. Risk and Safety Statements Risk and Safety Statements, also known as R/S statements, R/S numbers, R/S phrases, and R/S sentences,