Lanthanum the first element of lanthanide series has

Question

Lanthanum the first element of lanthanide series has (A) only unfilled 3d orbitals (B) unfilled 3d and 4d orbitals (C) unfilled 4d and 4f orbitals (D) unfilled 4f and Sd orbitals

Tardigrade Admin · Accepted Answer

Lanthanum has unfilled 4f and 5d orbitals.

Q. Lanthanum the first element of lanthanide series has

only unfilled 3d orbitals

unfilled 3d and 4d orbitals

unfilled 4d and $4 f$ orbitals

unfilled $4 f$ and Sd orbitals

Lanthanum has unfilled 4f and 5d orbitals.