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The alkaline earth metals are a series of elements that make up Group 2 of the periodic table: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra). The alkaline earth metals are a prime example of group trends in properties in the periodic table, with a trend of similar for behavior going down the group. Here is the number of Electrons per shell:
|Z||Element||No. of electrons/shell|
|12||Magnesium||2, 8, 2|
|20||Calcium||2, 8, 8, 2|
|38||Strontium||2, 8, 18, 8, 2|
|56||Barium||2, 8, 18, 18, 8, 2|
|88||Radium||2, 8, 18, 32, 18, 8, 2|
Alkaline earth metals will react readily with halogens.