The atomic numbers of elements of the second inner transition elements lie in the range of
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Answer : 90 to 103
The second inner transition elements involves the filling of 5f orbitals.Prior to this 7s7s and 6d16d1 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.
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