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| 1. |
Atomic radius of Cu is greater than that of Cr but ionic ofCr^(2+)is greater than that of Cu^(2+). Give suitable explanation. |
| Answer» Solution :In Cu, all the d-electronsarepaired `(3d^(10)4s^(1))`. In CR , all the d-ELECTRONS are unpaired`( 3d^(5) 4s^(1))`. Hence, d-delectron repulsion in Cu are much greater than those in Cr. Therefore ,Cu atomis larger size than Cr. In `Cu^(2+) (3d^(9))`, d-d electron repulsions decrease due to presenceofone unpaired d-electron. MOREOVER, the electrons are attracted by 29 PROTONS of the nucleus whereas in `Cr^(2+)`, three unpaired electrons are still presenct but they are attractedby only 24 protons of the nucleus. Thus , `Cu^(2+)`issmaller in size than`Cr^(2+)`. | |