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Beryllium- 1s2, 2s2 or [He] 2s2

Magnesium- 1s2, 2s2, 2p6, 3s2 or [Ne] 3s2

Calcium- 1s2, 2s2, 2p6, 3s2, 3p6,4s2 or [Ar] 4s2

Strontium- 1s2, 2s2, 2p6,3s2,3p6, 4s2, 3d10, 4p6,5s2 or [Kr] 5s2

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