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General Characteristics of the p-block Elements

Telangana Open School (TOSS) · Class 12 · Chemistry

Quick revision notes for General Characteristics of the p-block Elements — Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Occurrence and Electronic Configuration

  • p-block elements include groups 13 to 18.
  • Some elements like oxygen, nitrogen, carbon, and sulfur occur both free and in combined forms.
  • Noble gases (group 18) occur only in free state.
2

Atomic and Ionic Size

  • Atomic size decreases across a period (left to right) due to increasing nuclear charge.
  • Atomic size increases down a group due to addition of new shells.
  • Smaller atoms have higher effective nuclear charge, pulling electrons closer.
3

Ionization Enthalpy

  • Ionization enthalpy increases across a period due to decreasing atomic size.
  • It decreases down a group due to increasing atomic size and shielding effect.
  • Exception: Group 15 has higher ionization enthalpy than group 16 due to half-filled p-orbitals (e.g., N > O).
4

Electron Gain Enthalpy and Electronegativity

  • Electron gain enthalpy becomes more negative (exothermic) across a period due to smaller size and higher nuclear charge.
  • It becomes less negative down a group due to larger size and electron repulsion.
  • Exception: Fluorine has less negative electron gain enthalpy than chlorine due to small size and high electron density.

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Full Notes

Key Concepts

The general outer electronic configurationAtomic radius decreases across a periodIt is the energy requiredIt is the energy change whenIt is the ability of

Frequently Asked Questions

What are the important topics in General Characteristics of the p-block Elements for Telangana Open School (TOSS) Class 12 Chemistry?
General Characteristics of the p-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 General Characteristics of the p-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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