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The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), [note 1] rubidium (Rb), caesium (Cs), [note 2] and francium (Fr). Together with hydrogen they constitute group 1, [note 3] which lies in the s-block of the periodic table.
Alkali metal, any of the six elements of Group 1 (Ia) of the periodic table—lithium, sodium, potassium, rubidium, cesium, and francium. The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids).
The alkali metals react with halogens (group 17) to form ionic halides; the heavier chalcogens (group 16) to produce metal chalcogenides; and oxygen to form compounds, whose stoichiometry depends on the size of the metal atom.
29 sie 2023 · The alkali metals are a group of elements in the periodic table with similar properties: They are all shiny, silvery-white, highly reactive metals. The alkali metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) and francium (Fr).
The Group 1 metals have a particular name: the alkali metals. This is due to the formation of alkali (basic) solutions upon their reaction with water. Table \(\PageIndex{3}\).1 lists the derivation of the names of the alkali metals.
27 sty 2016 · Atoms of alkali metals have the largest atomic radii of elements in their periods. Alkali metals are highly reactive elements. In particular, they readily react with halogens and other nonmetals. The pure metals react with oxygen in air and with water. As you move down the group, reactivity increases.
18 lip 2023 · Li, Na, K, Rb, and Cs are all group IA elements, also known as the alkali metals. The seventh member of the group, francium (Fr) is radioactive and so rare that only 20 atoms of Fr may exist on Earth at any given moment [1]. The term alkali is derived from an Arabic word meaning “ashes.”
