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The electron configuration of the element found in period 4 and group 2a​
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The electron configuration of the element found in period 4 and group 2a​

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Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are harder and less reactive than the alkali metals of Group 1A.

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