Long Form of Periodic Table — Prelims Strategy

Prelims Strategy

For NEET prelims, a strong grasp of the long form of the periodic table is essential. The strategy should focus on quick and accurate identification of an element's position and its associated properties.

1
Master Electronic Configuration: — Be proficient in writing electronic configurations for elements up to Z=54 (Xenon) and understanding the general trends for higher atomic numbers. This is the key to determining period, group, and block. Remember the Aufbau principle, Hund's rule, and Pauli's exclusion principle.
2
Period Identification: — The highest principal quantum number ($n$) in the electronic configuration directly gives the period number. Practice this for various elements.
3
Block Identification: — The subshell (s, p, d, or f) where the last electron enters determines the block. This is straightforward once the configuration is known.
4
Group Identification (Rules): — Memorize the rules for determining group numbers for each block:

* s-block: Group = number of valence electrons. * p-block: Group = 10 + number of valence electrons. * d-block: Group = (electrons in $(n-1)d$) + (electrons in $ns$). * f-block: Always Group 3.

1
IUPAC Nomenclature: — Learn the numerical roots (un, bi, tri, quad, etc.) for digits 0-9 and practice forming names and symbols for elements with Z > 100. This is a factual recall item.
2
General Properties of Blocks: — Understand the broad characteristics of s, p, d, and f-block elements (e.g., reactivity, metallic character, oxidation states, color of ions). This helps in conceptual questions.
3
Practice MCQs: — Solve a variety of MCQs, including those that require identifying position, naming elements, and relating position to general properties. Pay attention to trap options, which often involve miscounting electrons or misapplying group rules.