whu Li property vary from other properties ? in alkali metals
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Answer:
This page discusses the trends in some atomic and physical properties of the Group 1 elements - lithium, sodium, potassium, rubidium and cesium. Sections below cover the trends in atomic radius, first ionization energy, electronegativity, melting and boiling points, and density.
Answer:
The alkali metals are a group of chemical elements from the s-block of the periodic table with similar properties: they appear silvery and can be cut with a plastic knife.
Alkali metals are highly reactive at standard temperature and pressure and readily lose their outermost electron to form cations with charge +1.
All the discovered alkali metals occur in nature.
Most alkali metals have many different applications, such as rubidium and caesium atomic clocks, sodium-vapor lamps, and table salt.
lye: A strong caustic alkaline solution of potassium or sodium salts, obtained by leaching wood ashes. It is much used in making soap as well as in biodiesel.
alkali metal: Any of the soft, light, reactive metals of Group 1 of the periodic table; lithium, sodium, potassium, rubidium, cesium, and francium.
caesium atomic clock: A primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency.
The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:
shiny
soft
silvery
highly reactive at standard temperature and pressure
readily lose their outermost electron to form cations with a charge of +1
They can all be cut easily with a plastic knife due to their softness, and their shiny surface tarnishes rapidly in air due to oxidation. Because of their high reactivity, alkali metals must be stored under oil to prevent reaction with air. In the modern IUPAC nomenclature, the alkali metals comprise the group 1 elements, excluding hydrogen. All the alkali metals react with water, with the heavier alkali metals reacting more vigorously than the lighter ones.
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