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The atomic number of potassium is \( 19 \& \) that of
P manganese is 25. Although the colour of \( \mathrm{MnO}_{4}^{-} \)is

W dark violet yet the \( \mathrm{K}^{+} \)is colourless. This is due to the fact that
(1) \( \mathrm{Mn} \) is a transition element; while \( \mathrm{K}^{+} \)is not
(2) \( \left[\mathrm{MnO}_{4}\right]^{-} \)is negatively charged; while \( \mathrm{K}^{+} \)has a positive charge.
(3) The effective atomic number of \( \mathrm{Mn} \) in \( \left[\mathrm{MnO}_{4}\right]^{-} \)is 26 ; while for \( \mathrm{K}^{+} \), the atomic number is 18
(4) The \( \mathrm{Mn} \) in a high positive oxidation state allows charge transfer transitions.
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