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CBSE Class 12-science Answered

how is lanthanoid and actinoid contraction different from the general trend of contraction alond any period?
Asked by kanwal sandhu | 21 Jan, 2012, 07:30: PM
Expert Answer
 In lanthanides, the nuclear charge increases by one unit at each successive element and this new electron enters the 4f-subshell. Due to the peculiar shapes of f-orbitals, there is imperfect shielding of electrons from the nuclear attraction. As a result of this the size of lanthanide atoms decreases.
 
It is different as in lanthanoid contraction the penultimate 4f orbitals are being filled.
Answered by | 22 Jan, 2012, 11:20: AM
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