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General electronic configuration of lanthanides is

1. (n − 2)f1−14 (n − 1)s2p6d0−1 ns2
2. (n − 2)f0−14 (n − 1)d0 ns2
3. (n − 2)f0−14 (n − 1)d0 ns2
4. (n − 2)f0−1 (n − 1)f1−14 ns2

Correct answer: (n − 2)f1−14 (n − 1)s2p6d0−1 ns2

Solution

The general electronic configuration of lanthanides is characterized by the filling of (n−2)f orbitals, with a range of 1 to 14 electrons, along with (n−1)s2p6d0−1 and ns2 electrons. This matches option A.

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