Hydrogen and s - block Elements
Kerala Board · Class 12 · Chemistry
Summary of Hydrogen and s - block Elements for Kerala Board Class 12 Chemistry. Key concepts, important points, and chapter overview.
Overview
This chapter explores hydrogen, the simplest element in the universe, and the s-block elements (alkali and alkaline earth metals) that form the most reactive metallic elements in the periodic table. From hydrogen's unique position and versatile compounds like water and hydrogen peroxide, to the high
Key Concepts
Hydrogen (1s¹) can be placed
Hydrogen (1s¹) can be placed with alkali metals (ns¹) by losing electron to form H⁺, or with halogens (ns²np⁵) by gaining electron to form H⁻ (hydride
Three isotopes exist
Three isotopes exist: Protium (¹H, 99.986%), Deuterium (²H or D, 0.014%), and Tritium (³H or T, radioactive, t₁/₂ = 12.33 years). Large mass differenc
Water (H₂O) has bent structure
Water (H₂O) has bent structure with 104.5° bond angle. Highly polar due to oxygen's electronegativity. Forms hydrogen bonds creating tetrahedral struc
H₂O₂ has oxidation state of oxygen
H₂O₂ has oxidation state of oxygen as -1 (between 0 in O₂ and -2 in H₂O). Acts as oxidizing agent: PbS + 4H₂O₂ → PbSO₄ + 4H₂O. Acts as reducing agent:
Group 1 metals (Li
Group 1 metals (Li, Na, K, Rb, Cs) with ns¹ configuration. Trends: Size increases (Li < Na < K < Rb < Cs), ionization energy decreases, reactivity inc
Learning Objectives
- Explain hydrogen's unique position in the periodic table and its resemblance to both alkali metals and halogens
- Compare properties of hydrogen isotopes (protium, deuterium, tritium) and understand isotope effects
- Analyze structure and properties of water, ice, and heavy water with their applications
- Study preparation, properties, and dual nature of hydrogen peroxide as oxidizing and reducing agent
- Understand electronic configuration, trends, and chemical properties of alkali metals (Li, Na, K, Rb, Cs)
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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