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d- and f-Block Elements

ICSE · Class 12 · Chemistry

Quick revision notes for d- and f-Block Elements — ICSE Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

60 questions45 flashcards5 concepts

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An infographic showing the trend in the nature of oxides (basic, amphoteric, acidic, neutral) across a period in the periodic table, with examples.
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Key Topics to Revise

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1. Position, Definition, and Classification

  • Transition elements are those in which the differentiating electron enters the (n-1)d subshell.
  • They belong to groups 3 to 12 of the periodic table.
  • The d-block lies between the s-block and p-block and shows intermediate behaviour between them.
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2. Electronic Configuration and Exceptional Cases

  • Transition elements usually have electronic configuration of the type (n-1)d1-10 ns1-2.
  • In the first transition series, electrons fill the 3d subshell from Sc to Zn.
  • Cr has the exceptional configuration [Ar] 3d5 4s1.
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3. Atomic Size, Ionic Size, Density, and Metallic Nature

  • Atomic radii in a transition series generally decrease with atomic number.
  • The decrease becomes small after the middle of the series.
  • Near the end of a series, atomic radii increase slightly due to increased electron-electron repulsion.
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4. Ionisation Enthalpy, Oxidation States, and Electrode Potentials

  • Ionisation enthalpies of transition elements lie between those of s-block and p-block elements.
  • The first ionisation enthalpy generally increases across a transition series, but not regularly.
  • First ionisation enthalpies of the third transition series are higher than those of the first and second series.

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Full Notes

Key Concepts

Transition elements are those elementsInner transition elements are thoseThe first transition series is ScChromium has [Ar] 3d5 4s1Zn

Frequently Asked Questions

What are the important topics in d- and f-Block Elements for ICSE Class 12 Chemistry?
Key topics in d- and f-Block Elements include d- and f-Block Elements — Complete Concept Map, Electronic Configuration Exceptions in 3d Series, Is an Element a True Transition Metal?. These are the concepts ICSE Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in d- and f-Block Elements — ICSE Class 12 Chemistry?
Understand the core concepts first, then work through the 60 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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