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5C 1d Why do transition metals have coloured compounds?
Gap-fill exercise
Fill in all the gaps, then press "Check" to check your answers.
3d absorbed electrons energy fall higher partially photons reflection visible visible white white Zinc
The energy difference between
filled
orbitals in transition metal
ions often corresponds to the energy of the
in visible light. These
photons can be
by the ions, causing
in lower energy
orbitals to be kicked into
obitals. When the electrons
back down
they release the
in the form of a
photon. If the compound
absorbs photons of light we see the colour due to
of all the other
colours in
light.
compounds, and those of non-transition metals,
appear
because any absorption or transmission of light is taking place
beyond the
region of the spectrum.
Check
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