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The d-And-f-Block Elements
Exactly half-filled and completely filled subshells are relatively more stable. Species try to attain the state of exactly half-filled and completely filled subshells configuration.
Mn2+ has extra stability as it has exactly half filled configuration of 4s° 3d5 in its outermost shell while Fe2+ has 45° 3d6 configuration. Therefore, Fe2+ has a tendency to loose one electron (or tends to oxidise to Fe3+) to acquire extra stability by having 4s0 3d5configuration.
Fe2+ → Fe3+ + e–(4s03d6) (4s03d5)
Since Mn2+ has half filled orbital thus it is more stable to Fe2+.
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The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?
Name the first element of 3rd transition series.
Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?
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