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| 1. |
The chemistry of the actionoid elements is not so smooth as that of the lanthanoids. Justify this statements by giving some examples from the oxidation state of these elements. |
| Answer» Solution :Lanthanoids SHOW a limited number of oxidation state, viz., +2, +3 and +4 (out of which +3 is the most common). This is because of a large energy GAP between 4f-, 5D- and 6s- subshells. The DOMINANT oxidation state of actinoids is also +3 but they show a number of other oxidation states also, Uranium (Z = 92) and plutonium (Z = 94), show +3, +4, +5 and +6, neptunium (Z = 93) shows +3, +4, +5 and +7, etc. This is due to small energy difference between 5-, 6d- and 7s-subshells of the actinoids. | |