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Fluorine(F) of a Group 7A(17) element or compound that fits each description or use:(a) Used in etching glass.
The chemical element fluorine has an atomic number of 9 and the symbol F. The lightest halogen, it is an extremely poisonous, pale yellow diatomic gas under normal conditions. It is exceedingly reactive and, as the most electronegative element, reacts with all other elements with the exception of argon, neon, and helium.
The manufacture of radioactive material for nuclear power plants and the insulation of electric towers both depend on fluorine. Glass is etched using hydrogen fluoride, a fluorine chemical. Like Teflon, fluorine is utilized to create plastics and is crucial for oral health. Minerals that today are known to contain fluorine were employed to etch glass in the late 1600s. The search for a chemical compound that might attack glass led to the discovery of the element (it is HF, a weak acid).
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