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Respected, Membars and Teacher plz explain What is d-d transmision and also f-f transmision? And give the reason why transition elements are colured? Thanks

3 years ago

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Acc to the the crystal feld theory,in the presence of a ligand atom the d subshell splits into two subshells called eg and t2g (g stands fr gerade). When an electron jumps frm eg to t2g  or vice versa it is called d-d transition. Due to this transition, the complexes r able to absorb and emit light light of a certain energies (depending on the CSE), thats why they r coloured compounds 

3 years ago
										

Transition elements are coloured due to the presence of unpaired electrons in the d orbit.


These unpaired electrons undergo transition within the d orbitals. ie.



When the electron moves from one orbital to another energy is released as em waves in visible spectrum. This movement of electrons occurs as the d orbitals has similar energy.

3 years ago

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