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What are the electronic configurations for the first twenty elements
H 1s¹ He 1s² Li [He] 2s¹ Be [He] 2s² B [He]2s²2p¹ C [He]2s¹2p² N [He] 2s²2p³ O [He]2s²2p⁴ F [He]2s²2p⁵ Ne [He]2s2p⁶ Na [Ne]3s¹ Mg [Ne]3s² Al [Ne]3s²3p¹ Si [Ne]3s²3p² P [Ne]3s²3p³ S [Ne]3s²3p⁴ Cl [Ne]3s²3p⁵ Ar [Ne]3s²3p⁶ K [Ar]4s¹ Ca [Ar]4s²
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