CampusFin

In d-block elements the irregularity in electronic configuration occurs in _____?

Review the verified answer and explanation for this ETEA Educational Testing and Evaluation Agency past-paper question on CampusFin.

In d-block elements the irregularity in electronic configuration occurs in _____? Answer: All of these

In d-block elements, irregularities in electronic configuration are observed especially in Chromium (Cr) and Copper (Cu). This occurs due to extra stability associated with half-filled (d⁵) and fully-filled (d¹⁰) d-orbitals. Hence, their configurations deviate from the expected Aufbau principle predictions to achieve more stable arrangements: Cr: [Ar] 4s¹ 3d⁵ (instead of 4s² 3d⁴) Cu: [Ar] 4s¹ 3d¹⁰ (instead of 4s² 3d⁹)

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the ETEA Educational Testing and Evaluation Agency preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.