A) \[C{{u}^{+}}\]
B) \[F{{e}^{+}}\]
C) \[F{{e}^{2+}}\]
D) \[F{{e}^{3+}}\]
Correct Answer: D
Solution :
\[F{{e}^{3+}}\]electronic configuration \[3{{s}^{2}}\,3{{p}^{6}}\,3{{d}^{5}}\],has half-filled d-orbital is more stable than \[C{{u}^{+}}\], \[F{{e}^{+}}\] and \[F{{e}^{2+}}\] . \[C{{u}^{+}}\] electronic configuration \[3{{s}^{2}}\text{ }3{{p}^{6}}\text{ }3{{d}^{10}}\]although having fully-filled 3rd shell is less stable because nuclear charge (29 protons) on \[Cu\] is not sufficient enough to hold 28 electrons.
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