The one which is not a typical cation of chromium is the option c) +5. chromium found in the form of Cr⁺², Cr⁺³ and Cr⁺⁶.
The transition metals will readily form the cation +2 and +3. the atomic number of the chromium is 24. the chromium belongs to d block transition elements. the electronic configuration is given as :
Cr = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵
the chromium loose one s electron and then a d electron and form Cr⁺², the chromium will loose more two electrons from the d and form Cr⁺³, which stable state, chromium will loose more electrons and form Cr⁺⁶.
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