4.2.2 - The Alkaline Earth Metals
4.2 - The Groups
The alkaline earth metals: Be, Mg, ca,
Sr, and Ba.
the alkaline earth metals.
- low densities, but higher than densities of the comparable alkali
- less reactive than the alkali metals
- all alkaline earth metals have two
valence electrons which form ions with a positive (2+) charge
- calcium is the fifth most abundance element; about 4% of the earth's
crust is Ca or Mg.
- calcium are found as calcium carbonate, CaCO3 in chalk, limestone,
marble, and calcite.
- magnesium metal is used in flash powder and photographic lightbulbs
- hard water contains calcium and magnesium ions
- beryllium and its compounds are toxic
- barium compounds are used as white pigments
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pictures of the elements:
Periodic Table Periods and Groups ..p106
Characteristics of the Groups ..p109