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The s-Block Elements are the elements in which the valence electron enters the outermost s-orbital. These elements occupy Group 1 and Group 2 of the periodic table and are known for their highly electropositive nature and strong reactivity.

This chapter is important for JEE Advanced Chemistry and frequently appears in conceptual and application-based questions.

Classification of s-Block Elements

Alkali Metals (Group 1)

The alkali metals include:

  • Lithium (Li)
  • Sodium (Na)
  • Potassium (K)
  • Rubidium (Rb)
  • Cesium (Cs)
  • Francium (Fr)

These elements possess one valence electron and readily form +1 ions.

Alkaline Earth Metals (Group 2)

The alkaline earth metals include:

  • Beryllium (Be)
  • Magnesium (Mg)
  • Calcium (Ca)
  • Strontium (Sr)
  • Barium (Ba)
  • Radium (Ra)

These elements contain two valence electrons and generally form +2 ions.

THE S-BLOCK ELEMENTS
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Important Concepts

Electronic Configuration

The outermost electronic configuration of s-block elements is:

  • Group 1: ns¹
  • Group 2: ns²

This configuration is responsible for their characteristic chemical properties.

Physical and Chemical Properties

  • Highly electropositive in nature.
  • Strong reducing agents.
  • Low ionization enthalpy.
  • High reactivity towards water and oxygen.
  • Formation of ionic compounds.

Important Compounds

Several compounds of s-block elements are industrially important, such as:

  • Sodium Hydroxide (NaOH)
  • Sodium Carbonate (Na?CO?)
  • Sodium Bicarbonate (NaHCO?)
  • Calcium Oxide (CaO)
  • Calcium Carbonate (CaCO?)

Applications

  • Manufacture of glass, soap, and detergents.
  • Cement and construction industries.
  • Metallurgical processes.
  • Fertilizer production.
  • Medical and biological applications.

Importance for JEE Advanced

The s-Block Elements is a high-scoring chapter in JEE Advanced Chemistry. Questions are commonly asked on periodic trends, anomalous properties of lithium and beryllium, important compounds, and chemical reactions of alkali and alkaline earth metals.

Key Topics Covered

  • s-Block Elements
  • Alkali Metals
  • Alkaline Earth Metals
  • Electronic Configuration
  • Physical Properties
  • Chemical Properties
  • Anomalous Behaviour
  • Important Compounds
  • Periodic Trends
  • Applications of s-Block Elements
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