By Monica Halka
Scientists categorize the chemical parts as metals, nonmetals, and metalloids mostly in accordance with the weather' skills to behavior electrical energy at common temperatures and pressures, yet there are different differences taken into consideration whilst classifying the weather within the periodic desk. The alkali metals, for instance, are metals, yet have such distinctive homes that they're given their very own type. an analogous is right for the alkaline earths.
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Additional info for Alkali and Alkaline earth metals (Periodic Table of the Elements)
In Chemical Reactions, Atoms Rearrange to Form New Compounds When a substance undergoes a physical change, the substance’s name does not change. What may change is its temperature, its length, its physical state (whether it is a solid, liquid, or gas), or some other characteristic, but it is still the same substance. On the other hand, when a substance undergoes a chemical change, its name changes; it is a different substance. For example, water can decompose into hydrogen gas and oxygen gas, each of which has substantially different properties from water, even though water is composed of hydrogen and oxygen atoms.
From batteries to lubricants and catalysts to pharmaceuticals, lithium and its compounds find a wide variety of uses. Lithium stands out among the alkali metals for several reasons. It is the lightest alkali metal and the least-dense element that is solid at room temperature and atmospheric pressure. Lithium has the highest melting point of the alkali metals. Its ion (Li+) is the smallest ion in the family. Although less abundant that sodium or potassium, lithium is still relatively inexpensive to obtain.
On the other hand, when a substance undergoes a chemical change, its name changes; it is a different substance. For example, water can decompose into hydrogen gas and oxygen gas, each of which has substantially different properties from water, even though water is composed of hydrogen and oxygen atoms. In chemical reactions, the atoms themselves are not changed. Elements (like hydrogen and oxygen) may combine to form compounds (like water), or compounds can be decomposed into their elements. The atoms in compounds can be rearranged to form new compounds whose names and properties are different from the original compounds.
Alkali and Alkaline earth metals (Periodic Table of the Elements) by Monica Halka