Question

Why trivalent lanthanoides have same color if unpaired electrons are same?

Answer 1

Some trivalent ions (M3+) are coloured in solid as well as in solution. The colour of lanthanide ion is due to absorption in visible region of the spectrum resulting  f-f transitions because they have partly filled orbitals. The colour of ions having nf electrons is about same with those having (14 – n)f electrons.
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