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Electronic formula of Magnesium atom.

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Electronic formula of Magnesium atom.

А.   1s2 2s2 2p6 3s2 3p6 4s2 

B.   1s2 2s2 2p6 3s2

C.   1s2 2s2 2p6 3s1

D.   1s2 2s2 2p6 3s2 3p6 4s2

E.  1s2 2s2

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B.   1s2 2s2 2p6 3s2 

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