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d-block and f-block Elements

Telangana Open School (TOSS) · Class 12 · Chemistry

Step-by-step guide to study d-block and f-block Elements in Telangana Open School (TOSS) Class 12 Chemistry. Topics to cover, practice strategy, and time allocation.

50 questions35 flashcards5 concepts

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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 50 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit d-block and f-block Elements after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • Transition elements have partially filled d-orbitals in atomic or ionic state.
  • d-block includes groups 3–12; transition elements are a subset.
  • Zinc, cadmium, and mercury are not transition elements due to fully filled d-orbitals in common ions.

  • General configuration: (n–1)d¹⁻¹⁰ ns¹⁻².
  • Cr and Cu show exceptional configurations due to stability of half-filled and fully filled d-orbitals.
  • Ionization removes 4s electrons before 3d electrons.

  • High melting points due to strong interatomic bonding.
  • Atomic radii decrease across the series due to poor shielding by d-electrons.
  • Densities are high and increase across the series.

Common Mistakes to Avoid

All d-block elements are transition elements.

The electronic configuration of Cr is [Ar] 3d⁴ 4s².

During ionization, transition metals lose 3d electrons before 4s electrons.

Memory Tips

Definition of transition elements: partially filled d-orbitals in atom or ion

Electronic configuration exception: Cr is [Ar] 3d⁵ 4s¹, not 3d⁴ 4s²

Cu has configuration [Ar] 3d¹⁰ 4s¹, not 3d⁹ 4s²

Variable oxidation states due to similar energy of ns and (n-1)d orbitals

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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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