what makes alkali metals different from the other metals?

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Kristen Lentz | Middle School Teacher | (Level 1) Educator Emeritus

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The Periodic Table is comprised of metals and nonmetals.  Most elements on the table are metals.  Alkali metals represent a special group of elements on the periodical table as the Group 1 elements (excluding hydrogen).  These metals are unique for several reasons: 

1) shiny/silvery composition

2)extremely soft, can be cut with a knife

3)highly reactive, easily lose their +1 charge

When exposed to air, alkali metals' shiny exterior will tarnish due to oxidation. 

All alkali metals can be found in nature. The list includes:lithium, potassium, sodium, rubidium, caesium, and francium.