Question

What are actinoids? Give their general electronic configuration.

Answer 1

The series of fourteen elements from ₉₀Th to ₁₀₃Lr which follow actinium (₈₉Ac) and in which differentiating electrons are progressively filled in 5 f-orbitals in prepenultimate shell are called actinoids.

Their general electronic configuration is, [Rn]⁸⁶ 5f^{1 - 14}6d^{0 - 1}7s²