§ 3NCERT Class 11 · Chemistry · Chapter 3
Chapter 3: Classification of Elements and Periodicity in Properties
From a librarian’s problem to a predictive law: why 118 elements needed a map, how weight-based tables rose and cracked, why Z replaced weight, and how configurations, blocks and trends turn the table into chemistry’s operating system. Seven topics, seven live labs, one mastery test.
Topics in this chapter
- § 3.1 Genesis of Periodic Classification: Triads to MendeleevMaster the genesis of periodic classification for JEE & NEET — Döbereiner triads, Newlands octaves, Mendeleev’s law, his predictions & a live oracle.
- § 3.2 Modern Periodic Law and the Present Form of the Periodic TableMaster modern periodic law for JEE & NEET — Moseley’s atomic number, the 18-column long form table, group names & a weight-vs-number live demo.
- § 3.3 Nomenclature of Elements with Atomic Numbers > 100Master IUPAC nomenclature for Z > 100 — digit roots, temporary names & symbols, spelling rules & a live decoder for any element from 101 to 199.
- § 3.4 Electronic Configurations & the Periodic Table: Block, Period, GroupMaster electronic configurations for JEE & NEET — Aufbau order, finding block, period and group from any configuration, Cr & Cu exceptions & a live finder.
- § 3.5 Types of Elements: s-, p-, d- and f- BlocksMaster the s, p, d and f blocks for JEE & NEET — general configurations, groups, transition element definition, lanthanoids, actinoids & a live block drill.
- § 3.6 Periodic Trends in Properties: Radius, Ionization Enthalpy & ElectronegativityMaster periodic trends for JEE & NEET — atomic radius, ionization enthalpy, electron gain enthalpy, electronegativity, all exceptions explained & a live…
- ✓ Chapter testAttempt all questions, then submit to see your score and the explanation for every answer.