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Lanthanide contraction occurs because (1) f-orbital are incompletely filled (2) f-orbital electrons are easily lost (3) f-orbital do not come out on the surface of atom and are buried inside (4) f-orbital electron are poor sheilders of nuclear charge |
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Answer» SOLUTION :Key: 4 The size of lanthanides are smaller than expected. This is associated with the filling up of 4f orbitals which MUST be filled before the 5d orbitals. The electrons in f-orbitals are not EFFECTIVE in screening other electrons from the nuclear charge. |
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