Be: 1s²2s² --- [He] hel
B: 1s²2s²2p¹ --- [He] hel
Ca: 1s²2s²2p⁶3s²3p⁶4s² --- [Ar] argon
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Be: 1s²2s² --- [He] hel
B: 1s²2s²2p¹ --- [He] hel
Ca: 1s²2s²2p⁶3s²3p⁶4s² --- [Ar] argon