Skip to main content
Super TutorResources
Chapter 17 of 41
Syllabus

d-block and f-block Elements — Syllabus

Telangana Open School (TOSS) · Class 12 · Chemistry

What d-block and f-block Elements covers in Telangana Open School (TOSS) Class 12 Chemistry: 4 topics, for the 2026-27 session.

50 questions35 flashcards3 formulas & key relations5 concepts

Interactive on Super Tutor

Studying d-block and f-block Elements? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for syllabus and more.

Try Super Tutor — Free

Free trial, no card needed.

4 Topics · Telangana Open School (TOSS) Class 12 Chemistry · 2026-27

Topics in d-block and f-block Elements

1

Transition Elements and Electronic Configuration

  • Transition elements are defined as those with partially filled d-orbitals in either atomic or ionic state.
  • General electronic configuration: (n-1)d¹⁻¹⁰ ns¹⁻².
  • Exceptions: Cr (Z=24) has configuration [Ar] 3d⁵ 4s¹ (not 3d⁴ 4s²) due to half-filled stability.
2

Physical and Chemical Properties of Transition Elements

  • High melting and boiling points due to strong metallic bonding and small atomic size.
  • High density increases across the series, peaking at groups 8–10.
  • Atomic radii decrease from left to right due to poor shielding by d-electrons, leading to increased effective nuclear charge.
3

Magnetic and Color Properties

  • Paramagnetism arises from unpaired electrons; more unpaired electrons mean higher magnetic moment.
  • Diamagnetic substances have all electrons paired.
  • Magnetic moment calculated using μ = √[n(n+2)] B.M., where n = number of unpaired electrons.
4

Alloy Formation, Interstitial Compounds, and Catalytic Properties

  • Transition metals form alloys due to similar atomic sizes allowing substitution in crystal lattice.
  • Interstitial compounds form when small atoms like H, C, N occupy voids in metal lattice — very hard and rigid.
  • Catalytic activity due to variable oxidation states and ability to adsorb reactants on surface.

Key Concepts

Central concept: Transition and Inner Transition Elements

d-Block ElementsCharacteristic Properties of Transition ElementsImportant Compoundsf-Block ElementsPhysical and Chemical Trends

Work through every topic in d-block and f-block Elements with notes and quizzes

Start This Chapter

Frequently Asked Questions

What are the important topics in d-block and f-block Elements for Telangana Open School (TOSS) Class 12 Chemistry?
Key topics in d-block and f-block Elements include Transition Elements and Electronic Configuration, Physical and Chemical Properties of Transition Elements, Magnetic and Color Properties, Alloy Formation, Interstitial Compounds, and Catalytic Properties. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise d-block and f-block Elements for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 50 practice questions on d-block and f-block Elements. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for d-block and f-block Elements

All Telangana Open School (TOSS) Class 12 Chemistry Syllabus

For serious students

Get the full d-block and f-block Elements chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for Telangana Open School (TOSS) Class 12 Chemistry. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free