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s-Block Group 2 Elements: Alkaline Earth Metals — Revision Notes

JEE Mains · Chemistry

Quick revision notes for s-Block Group 2 Elements: Alkaline Earth Metals — key concepts, formulas, and definitions for JEE Mains Chemistry preparation.

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A diagram illustrating the general electronic configuration of Group 2 elements, showing a noble gas core and two valence electrons in the outermost 'ns' orbital.
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Revision Notes — s-Block Group 2 Elements: Alkaline Earth Metals

Key concepts, formulas, and definitions from s-Block Group 2 Elements: Alkaline Earth Metals for JEE Mains Chemistry preparation.

Key Topics to Revise

1

General Characteristics and Electronic Configuration

  • General electronic configuration: ns² where n = 2 to 7
  • All form M²⁺ ions by losing two valence electrons
  • Atomic and ionic radii increase down the group: Be < Mg < Ca < Sr < Ba
2

Chemical Reactivity and Reactions

  • Reactivity increases down the group: Be < Mg < Ca < Sr < Ba
  • Be doesn't react with water; Mg reacts with hot water; others react with cold water
  • All form hydrides (MH₂), oxides (MO), and halides (MX₂)
3

Important Compounds - Oxides and Hydroxides

  • All oxides have rock-salt structure except BeO (wurtzite structure)
  • BeO is amphoteric; others are basic with increasing basicity down the group
  • Thermal stability of carbonates increases down the group
4

Halides and Salt-like Compounds

  • Be halides are covalent and polymeric; others are ionic
  • BeCl₂ has bridged structure in solid state, linear in vapor state
  • Hydration tendency decreases down the group

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Key Concepts

All alkaline earth metals have ns²Down the groupDespite high second ionization energyAll form monoxides (MO) with highBeryllium halides are covalent and polymeric

Frequently Asked Questions

What topics are covered in s-Block Group 2 Elements: Alkaline Earth Metals for JEE Mains?
s-Block Group 2 Elements: Alkaline Earth Metals is an important chapter in JEE Mains Chemistry. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: General Characteristics and Electronic Configuration, Chemical Reactivity and Reactions, Important Compounds - Oxides and Hydroxides, Halides and Salt-like Compounds.
How important is s-Block Group 2 Elements: Alkaline Earth Metals for JEE Mains?
s-Block Group 2 Elements: Alkaline Earth Metals is a frequently tested chapter in JEE Mains Chemistry. Questions from this chapter appear regularly in previous year papers. There are 56 practice questions available for this chapter.
How to prepare s-Block Group 2 Elements: Alkaline Earth Metals for JEE Mains?
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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