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The atomic numbers of elements of the second inner transition elements lie in the range of

$\begin{array}{1 1}\text{88 to 101}\\\text{89 to 102}\\\text{90 to 103}\\\text{91 to 104}\end{array} $

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Answer : 90 to 103
The second inner transition elements involves the filling of 5f orbitals.Prior to this $7s$ and $6d^1$ orbitals are filled.The seventh period starts with atomic number 87(=2+8+18+18+32+1).5f orbitals start filling with atomic number 90.
answered Jul 25, 2014 by sreemathi.v

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