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Revision Notes

The d-and f-Block Elements

Punjab Board · Class 12 · Chemistry

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

45 questions35 flashcards5 concepts

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Key Topics to Revise

1

Position in the Periodic Table and Electronic Configurations

  • The d-block occupies Groups 3–12 in the periodic table, placed between s-block and p-block.
  • There are four series of transition metals: 3d (Sc to Zn), 4d (Y to Cd), 5d (La and Hf to Hg), and 6d (Ac and Rf to Cn).
  • General electronic configuration: (n-1)d^(1-10) ns^(1-2), where n is the principal quantum number of the outermost shell.
2

General Physical Properties of 3d Transition Metals

  • All transition metals are hard, strong, ductile, malleable and have high thermal and electrical conductivity (typical metallic properties).
  • Exceptions to typical metallic structure: Zn, Cd, Hg, Mn.
  • High melting and boiling points: attributed to strong interatomic bonding involving both ns and (n-1)d electrons. More unpaired electrons → stronger bonding.
3

Ionisation Enthalpies

  • First ionisation enthalpy generally INCREASES across the 3d series due to increasing nuclear charge.
  • The increase is much LESS steep compared to main group elements because d electrons provide somewhat effective shielding.
  • 3d electrons shield the outer 4s electrons from increasing nuclear charge → atomic radii decrease slowly → ionisation enthalpies increase gradually.
4

Oxidation States of Transition Metals

  • Transition metals show VARIABLE oxidation states — a characteristic property arising from incomplete d orbital filling.
  • Oxidation states of d-block elements differ by unity (e.g., V shows +2, +3, +4, +5), unlike p-block where they differ by 2.
  • The maximum oxidation state = total number of s + d electrons, achieved up to Mn: Ti(+4), V(+5), Cr(+6), Mn(+7).

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Full Notes

Key Concepts

DGeneral formula for dTransition metals are defined as metalsTransition metals show high meltingWithin a series

Frequently Asked Questions

What are the important topics in The d-and f-Block Elements for Punjab Board Class 12 Chemistry?
Key topics in The d-and f-Block Elements include d-Block and f-Block Elements: Comprehensive Overview, Complete Overview of d- and f-Block Elements, D-Block Elements: Properties and Characteristics. These are the concepts Punjab Board Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in The d-and f-Block Elements — Punjab Board Class 12 Chemistry?
Understand the core concepts first, then work through the 45 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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