A) Scandium
B) Chromium
C) Manganese
D) Iron
Correct Answer: B
Solution :
The electronic configuration of samarium is as: \[Sm(Z=62):\text{ }\!\![\!\!\text{ }Xe]\text{ }6{{s}^{2}}\text{ }4\text{ }{{f}^{6}}\] Number of unpaired electron = 6 The electronic configuration of chromium is as: \[Cr(Z=24):\text{ }\!\![\!\!\text{ }Ar]\text{ }3{{d}^{5}}4{{s}^{1}}\] Number of unpaired electrons = 6 Hence, Sm and Cr both have same number of unpaired electrons.
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