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
Extraordinary assumptions and hypothetical conditions an appraiser identify specific assignment elements in the planning of an appraisal assignment and gather and analyze information about those elements, including assignment conditions, which include assumptions, extraordinary assumptions, hypothetical conditions, and hypothetical conditions. Additionally, all USPAP standards dealing with the development of appraisals, consulting, or mass appraisal specifically require that any extraordinary assumptions and any hypothetical conditions necessary in the assignment be identified in the course of formulating the appraisal problem and planning the scope of work. Under USPAP, an appraisal may be predicated on extraordinary assumptions only under certain conditions, specifically Similarly, an appraisal may also be predicated