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Answer the question Explain the follow...

Answer the question
Explain the following
(1) Why do transition metal ions possess a great tendency to form complexes?
(2) The paramagnetic character in 3d-transition series elements increases up to Mn and decreases.

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(1) Due to small size, high nuclear charge, availability of vacant d-orbitals of suitable energy to accommodate lone pairs of electrons donated by the ligands
(2) On moving from Sc to Mn, the number of unpaired electrons increases and hence paramagnetic character increases. But after Mn, the pairing of electrons in the d-subshell starts and the number of unpaired electrons and hence paramagnetic character decreases.
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