General Introduction — Prelims Strategy

Prelims Strategy

For NEET UG, mastering the 'General Introduction' to d and f block elements requires a focused approach on electronic configurations and definitions. Firstly, commit the general electronic configurations for both d-block ($(n-1)d^{1-10}ns^{1-2}$) and f-block ($(n-2)f^{1-14}(n-1)d^{0-1}ns^2$) to memory, paying close attention to the principal quantum numbers.

Secondly, thoroughly understand the exceptions to the Aufbau principle for d-block elements, particularly Chromium (Cr) and Copper (Cu), as these are frequent targets for MCQs. Practice writing configurations for elements in the first transition series.

Thirdly, internalize the precise definition of a 'transition element' and why elements like Zinc, Cadmium, and Mercury are classified as d-block but not true transition elements. This distinction is a classic NEET trap.

Finally, be familiar with the names of the f-block series (lanthanoids and actinoids) and which f-orbitals (4f or 5f) are being filled in each. For conceptual questions, always refer back to the fundamental electronic structure.

For identification questions, quickly recall the atomic numbers where f-block filling begins (Z=58 for 4f, Z=90 for 5f) to correctly place elements.