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- Quhen alkale të gjitha ato substanca që janë të afta të neutralizojne acidet. Kështu që me "alkalin" edhe në ditët e sotme kuptohet ose një metal i grupit të parë ose një bazë. Metalet alkaline shfaqin në përbërjet e tyre gjithmonë numër oksidimi +1. Janë reduktues shumë të fortë, reagojnë vrullshëm me ujin duke reduktuar hidrogjenin.
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Metalet alkaline. Hidrogjeni bën pjesë në grupin e parë, por nuk ësht një metal alkalin. Quhen alkale të gjitha ato substanca që janë të afta të neutralizojne acidet. Kështu që me "alkalin" edhe në ditët e sotme kuptohet ose një metal i grupit të parë ose një bazë. Metalet alkaline shfaqin në përbërjet e tyre gjithmonë ...
- Alkali - Wikipedia
Alkali është një substancë e aftë për formimin e joneve të...
- Alkali metal - Wikipedia
The alkali metals consist of the chemical elements lithium...
- Alkali - Wikipedia
Vetit. Kategoritë. Lidhjet e jashtme. Metalet. Më shumë se 91% e elementeve kimike janë metale. Disa nga metalet njeriu i ka njohur që në kohet e lashta, duke u njohur në vetitë e hekurit, nikelit, kromit, bakrit. Metalet me se shpeshti i hasim ne koren e tokes,por ato ne perqindje te vogel i hasim edhe te organizmat e gjallë te cilet ...
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- History
The alkali metals are six chemical elements in Group 1, the leftmost column in the periodic table. They are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). (Like the other elements in Group 1, hydrogen (H) has one electron in its outermost shell, but it is not classed as an alkali metal since it is not a metal but a gas at room temperature.)
Periodic Table of the Elements
Brush up on the periodic table of elements.
Why are they called the alkali metals?
The alkali metals are so named because when they react with water they form alkalies. Alkalies are hydroxide compounds of these elements, such as sodium hydroxide and potassium hydroxide. Alkalies are very strong bases that are caustic. Lye, for example, is sodium hydroxide. Alkalies react with acids to form salts.
base
Alkali metal salts were known to the ancients. The Old Testament refers to a salt called neter (sodium carbonate), which was extracted from the ash of vegetable matter. Saltpetre (potassium nitrate) was used in gunpowder, which was invented in China about the 9th century ad and had been introduced into Europe by the 13th century.
In October 1807 the English chemist Sir Humphry Davy isolated potassium and then sodium. The name sodium is derived from the Italian soda, a term applied in the Middle Ages to all alkalies; potassium comes from the French potasse, a name used for the residue left in the evaporation of aqueous solutions derived from wood ashes.
Lithium was discovered by the Swedish chemist Johan August Arfwedson in 1817 while analyzing the mineral petalite. The name lithium is derived from lithos, the Greek word for “stony.” The element was not isolated in pure form until Davy produced a minute quantity by the electrolysis of lithium chloride.
While the German chemists Robert Bunsen and Gustav Kirchhoff were investigating the mineral waters in the Palatinate in 1860, they obtained a filtrate that was characterized by two lines in the blue region of its spectrum (the light emitted when the sample was inserted into a flame). They suggested the presence of a new alkali element and called it cesium, derived from the Latin caesius, used to designate the blue of the sky. The same researchers, on extracting the alkalies from the mineral lepidolite, separated another solution, which yielded two spectral lines of red colour. They proposed the name rubidium for the element in this solution from the Latin rubidus, which was used for the darkest red colour. Francium was not discovered until 1939 by Marguerite Perey of the Radium Institute in Paris.
In chemistry, an alkali ( / ˈælkəlaɪ /; from Arabic: القلوي, romanized : al-qaly, lit. 'ashes of the saltwort ') is a basic, ionic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0.
The alkali metals. Notice that most of the samples are either stored in mineral oil or sealed in glass tubes to prevent thier reoxidation by atmospheric oxygen. The images of the alkali metals are adapted from those at en.Wikipedia.org/wiki/Alkali_metal. Individual image credits for the alkali metals are given in reference two at the end of ...
