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p-Block Group 17 Elements: The Halogen Family — Revision Notes

JEE Advanced · Chemistry

Quick revision notes for p-Block Group 17 Elements: The Halogen Family — key concepts, formulas, and definitions for JEE Advanced Chemistry preparation.

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A section of the periodic table highlighting Group 17 (Halogen Family) elements: Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).
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Revision Notes — p-Block Group 17 Elements: The Halogen Family

Key concepts, formulas, and definitions from p-Block Group 17 Elements: The Halogen Family for JEE Advanced Chemistry preparation.

Key Topics to Revise

1

1. General Introduction and Occurrence

  • Electronic configuration: ns²np⁵ (one electron short of noble gas configuration)
  • All exist as diatomic molecules (X₂) due to single covalent bond formation
  • Physical states at room temperature: F₂, Cl₂ (gases), Br₂ (liquid), I₂ (solid)
2

2. Atomic and Physical Properties

  • Atomic radii increase down the group: F < Cl < Br < I (due to additional shells)
  • Ionic radii (X⁻): F⁻ < Cl⁻ < Br⁻ < I⁻ (anions larger than atoms due to electron addition)
  • Ionization enthalpy decreases: F > Cl > Br > I (size effect)
3

3. Chemical Properties and Oxidation States

  • Oxidation states: F shows only -1 (except +1 in HOF), others show -1, +1, +3, +5, +7
  • Higher oxidation states possible due to vacant d-orbitals (except F)
  • Oxidizing power: F₂ > Cl₂ > Br₂ > I₂ (based on standard electrode potentials)
4

4. Preparation Methods

  • Fluorine: Electrolysis of anhydrous KHF₂ using Pt-Ir electrodes at low temperature
  • Chlorine: (1) Electrolysis of brine, (2) Deacon's process, (3) Laboratory: MnO₂ + HCl
  • Bromine: Displacement from bromides using Cl₂, commercially from sea water

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Key Concepts

All halogens have ns²np⁵ configurationOxidizing power decreases down the groupHF is liquid due to hydrogenFluorine differs due to smallest sizeFluorine forms only OF₂ and O₂F₂

Frequently Asked Questions

What topics are covered in p-Block Group 17 Elements: The Halogen Family for JEE Advanced?
p-Block Group 17 Elements: The Halogen Family is an important chapter in JEE Advanced Chemistry. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: 1. General Introduction and Occurrence, 2. Atomic and Physical Properties, 3. Chemical Properties and Oxidation States, 4. Preparation Methods.
How important is p-Block Group 17 Elements: The Halogen Family for JEE Advanced?
p-Block Group 17 Elements: The Halogen Family is a frequently tested chapter in JEE Advanced Chemistry. Questions from this chapter appear regularly in previous year papers. There are 53 practice questions available for this chapter.
How to prepare p-Block Group 17 Elements: The Halogen Family for JEE Advanced?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.

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