Electronic Configuration & Periodic Properties

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1.
The colour of Cu^2+(aq) changes from blue to deep blue when excess NH3 is added because:
2.
The correct electronic configuration of Cr (Z=24) is:
3.
The electronic configuration of Cu^2+ is:
4.
Which of the following M^2+ ions has the maximum number of unpaired electrons?
5.
Which transition metal ion can act as both an oxidising agent and a reducing agent?

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