By Monica Halka
Scientists categorize the chemical components as metals, nonmetals, and metalloids mostly in line with the weather' talents to behavior electrical energy at common temperatures and pressures, yet there are different differences taken under consideration whilst classifying the weather within the periodic desk. The alkali metals, for instance, are metals, yet have such distinct houses that they're given their very own type. a similar is right for the alkaline earths.
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Davy discovered that the metal reacted with water to liberate hydrogen gas; it was the burning of the hydrogen that produced the flame. ” Davy then repeated the experiment using soda ash. He found that a stronger electrical current was required, and within a few days of his isolation of potassium, he discovered sodium (named because it came from soda ash). At first, other scientists doubted that Davy’s potassium and sodium were, in fact, true elements. They thought that maybe Davy’s “elements” were compounds of potassium or sodium and hydrogen.
Lithium hydroxide’s light weight and relatively low cost have recommended it over other alkali hydroxides, any of which could do the same job. Lithium hydroxide is water soluble, however, which is undesirable in situations where less care might be taken to keep it dry. The Toshiba company has been working on a lithium silicate absorption device that could turn out to be cost-effective for use in absorbing CO2 from car exhaust. The difficulty is in making a device small enough to fit in a typical automobile exhaust system.
This convenient method has been used successfully to keep air breathable for humans living in extreme environments like deep-sea diving apparatuses, submarines, space suits, and spacecraft. One of the many serious problems that occurred during the Apollo 13 lunar mission involved LiOH canisters that didn’t fit the air purification system. Lithium hydroxide’s light weight and relatively low cost have recommended it over other alkali hydroxides, any of which could do the same job. Lithium hydroxide is water soluble, however, which is undesirable in situations where less care might be taken to keep it dry.
Alkali and Alkaline earth metals (Periodic Table of the Elements) by Monica Halka