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What is the electron configuration for a calcium atom? 1s2, 2s2, 2p6, 3s2, 3p6, 4s2 1s2, 2s2, 2p6, 3s2, 3p6, 4s1 2s2, 2s2, 2p6, 3s2, 3p6, 4s1 1s1, 2s2, 2p6, 3s2, 3p6, 4s1