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Account for the following: (a) Europium(II) is more stable than cerium(II). (b) Transition metals have high enthalpies of atomisation. (c) Actinoid ions are generally coloured. |
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Answer» Solution :(a) Europium(II) has stable electronic configuration [Xe] `4f^(7)5d^(0)6s^(0)` while ccrium(II) has comparatively LESS stable configuration [Xe] `4f^(2)5d^(0)6s^(0)`. (b) TRANSITION metals have high values of enthalpies of atomisation. This is due to a large number of electrons in their atoms. They give rise to strong interatomic interactions and hence strong bonding between their molecules. (c) Actinoid IONS are generally COLOURED. This can be explained in terms of UNPAIRED electrons undergoing f-f transitions. |
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