The Lathandies are characterized by the uniform `[+n]` oxidation state show by all the Lathanides. What is the value of 'n'

Answer

3

Explanation

The `4f e^(-)` in the antepenultimate shell are very effectivity shielded from their chemical environment outside the atom by `5s` and `5pe^(-)`. Consequently the `4f e^(-)` do not take part in bonding.