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Revision Notes

d-block and f-block Elements

Telangana Open School (TOSS) · Class 12 · Chemistry

Quick revision notes for d-block and f-block Elements — Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

50 questions35 flashcards5 concepts

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Key Topics to Revise

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.

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Full Notes

Key Concepts

Transition elements are those inDue to the small energy differenceThe steady decrease in atomicTransition metal ions are often coloredTransition metals act as catalysts due

Frequently Asked Questions

What are the important topics in d-block and f-block Elements for Telangana Open School (TOSS) Class 12 Chemistry?
d-block and f-block Elements covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in d-block and f-block Elements — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 50 practice questions available for this chapter. Revise formulas and 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.

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