Which of the following configuration is correct for iron ?
(a) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d⁴
(b) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d⁶ 4s²
(c) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d²
(d) 1s², 2s² 2p⁶, 3s² 3p⁶ 3d² 4s²
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B IS CORRECT ANSWER......................
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