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The outer electronic configuration of La (atomic No. 57) is:

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5s²5p⁶

5s²5p⁶5d¹

5s²5p⁶4f¹

5s²5p⁵4f²

answer is B.

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Detailed Solution

Atomic no. 57 is of lanthanum

and its electronic configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s²4p⁶ 4d¹⁰5s² 5p⁶ 5d¹6s²

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