Chemistry

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What are the electronic configurations for the first twenty elements

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  • 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