1.

Explain why Gd3+ is colourless.

Answer»

The atomic no. of Gd is 64. Electronic configuration is (Xe)4f*7 5d*1 6s*2. In Gd +3, there are 61 electrons. Hence electronic configuration will be( Xe)4f*7. Hence no electrons are there in outer d orbital. Due to this it is colourless

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