Question

why Gd3+ is colourless .

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Answer 1

Answer:

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.

Explanation:

Since it's a f-block element, so its bonding orbital is f and its configuration of [Xe] 4f7 5d1 6s2

Thus f orbital is half filled acting as inert one. But f-block elements generally have partially filled f-orbital, which give others a characteristic as coloured, it act abnormally with respect to them.

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