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General Characteristics of the p-block Elements — Syllabus

Telangana Open School (TOSS) · Class 12 · Chemistry

What General Characteristics of the p-block Elements covers in Telangana Open School (TOSS) Class 12 Chemistry: 4 topics, for the 2026-27 session.

50 questions30 flashcards5 concepts

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4 Topics · Telangana Open School (TOSS) Class 12 Chemistry · 2026-27

Topics in General Characteristics of the p-block Elements

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.

Key Concepts

Central concept: p-block Elements

Electronic ConfigurationAtomic SizeIonization EnthalpyElectron Gain EnthalpyElectronegativityMetallic and Non-metallic BehaviorAnomalous Behavior of First ElementInert Pair Effect

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Frequently Asked Questions

What are the important topics in General Characteristics of the p-block Elements for Telangana Open School (TOSS) Class 12 Chemistry?
Key topics in General Characteristics of the p-block Elements include Occurrence and Electronic Configuration, Atomic and Ionic Size, Ionization Enthalpy, Electron Gain Enthalpy and Electronegativity. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise General Characteristics of the p-block Elements for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 50 practice questions on General Characteristics of the p-block Elements. Revise 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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