Question

The electronic configuration of lanthanum (At. no. 57) is [Xe] ______.

Answer 1

The electronic configuration of lanthanum (At. no. 57) is [Xe] 5d¹ 6s².

Explanation:

Lanthanum has an atomic number of 57. After the xenon core [Xe], the next electrons enter the 6s and 5d orbitals. The 4f orbitals start filling only from cerium (Z = 58), not from lanthanum.