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What is the electronic configuration of Beryllium atom

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What is the electronic configuration of Beryllium atom

А. 1s1 2s1

B. 1s2 2s2

C. 1s2 2s2 2p6 3s1

D. 1s2 2s0

E. 1s2 2s2 2p6 3s2 3p6 4s1

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1s2 2s2  is the electronic configuration of Beryllium atom .

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