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| 1. |
In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ mol^(-1). Why ? |
| Answer» SOLUTION :In the series, Sc to Zn, all elements have ONE or more unpaired ELECTRONS except zinc which has no unpaired electron, its outer electronic configuration being `3d^(10)4s^(2)`. Lower the number of unpaired electrons, lower is the metal-metal bonding. HENCE, metal-metal bonding is weakest in zinc. Therefore, ENTHALPY of atomisation is lowest. | |