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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
Question
Write the outer electronic configuration of lanthanoids.
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Answer

$4 \mathrm{f}^{1-14} 5 \mathrm{~d}^{0-1} 6 \mathrm{~s}^2$

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