The electronic structure of four elements, Chemistry

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The electronic structure of four elements A, B, C, D are:

(1) 1s²

(2) 1s², 2s^2, 2p²,

(3) 1s^2, 2s², 2p⁵,

(4) 1s², 2s², 2p⁶

Ans: 1s², 2s², 2p⁵,

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