Lithium Lithium Lithium (from ) is a chemical element with symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the lightest metal and the lightest solid element. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. When cut, it exhibits a metallic luster, but moist air corrodes it quickly to a dull silvery gray, then black tarnish. It never occurs freely in nature, but only in (usually ionic) compounds, such as pegmatitic minerals which were once the main source of lithium. Due to its solubility
Standard conditions for temperature and pressure below: Technical literature can be confusing because many authors fail to explain whether they are using the ideal gas constant "R", or the specific gas constant "R". The relationship between the two constants is "R" = "R" / "m", where "m" is the molecular mass of the gas. The US Standard Atmosphere (USSA) uses 8.31432 m·Pa/(mol·K) as the value of "R". However, the USSA,1976 does recognize that this value is not consistent with the values of the Avogadro constant and the Boltzmann constant. Standard conditions for temperature and pressure Standard conditions for temperature and pressure are standard sets of conditions