Answer:
Elements are typically classified as either a metal or nonmetal, but the dividing line between the two is fuzzy. Metal elements are usually good conductors of electricity and heat. The subgroups within the metals are based on the similar characteristics and chemical properties of these collections.The far left side of the periodic table includes two groups of highly reactive metals. With the exception of hydrogen, the first column consists of the soft, shiny alkali metals. These metals have only one electron in their valence shell, which is easily donated to another atom in chemical reactions. Because of their explosive reactivity in both air and water, the alkali metals are rarely found in their elemental form in nature. In the second group, the alkaline earth metals have two valence electrons, making them slightly harder and less reactive. However, these metals are still rarely found in their elemental form
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