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| 1. |
The second ionisation enthalpies of both Cr and Cu are higher than those of the next element. Explain. |
| Answer» Solution :This is because the outer electronicconfiguration of `Cr^(+)` is `3d^(5)` ( HALF - FILLED ) and that of `Cu^(+)` is `3d^(10)` ( completely filled ). The SECOND ionisationof Cr means the REMOVAL of ONE electron from the highly stable `3d^(5)` core. Similarly, the second ionisation of Cu needs removal of one electron from highly stable `3d^(10) ` core. | |