Question

What Is The Lightest Alkali Metal?

Answer 1

The chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr) make up the alkali metals (Fr). They make up group 1, which is located in the s-block of the periodic table, along with hydrogen. The outermost electron of all alkali metals is in an s-orbital configuration; as a result of this shared electron configuration, their distinctive characteristics are remarkably similar. Indeed, the alkali metals are the finest illustration of periodic table group trends in characteristics, with elements displaying well-defined homologous behaviour. After its leader member, this family of elements is known as the lithium family.

Complete answer:
Lithium is a chemical element with the atomic number 3 and the symbol Li. It's a silvery-white alkali metal that's pleasant to the touch. It is the lightest metal and the lightest solid element under normal circumstances. Lithium, like all alkali metals, is very reactive and combustible, thus it must be kept in a vacuum, inert environment, or inert liquid like refined kerosene or mineral oil. It has a metallic sheen when cut, but wet air rapidly corrodes it to a dull silvery grey, then black tarnish. It is exclusively found in compounds in nature, such as pegmatitic rocks, which were previously the primary source of lithium. Lithium is the lightest alkali metal. Lithium is the lightest solid element on the planet. Within the Big Bang concept, the most frequent residuals are hydrogen and helium. Li, Be, and B are uncommon because they were poorly synthesised in the Big Bang and in stars; cosmic ray spallation is the major source of these elements. Lithium, with a density of $0.534{\text{ }}gc{m^{ - 3}}$ ,is the lightest and least dense metal that is a pure element. Because lithium is roughly half the density of water, a slice of the metal would float if it weren't so reactive. Water is less dense than two other metallic elements.

Note:
Heat-resistant glass and ceramics, lithium grease lubricants, flux additives for iron, steel, and aluminium manufacturing, lithium batteries, and lithium-ion batteries are only a few of the industrial applications for lithium and its compounds. More than three-quarters of lithium output is used for these purposes.