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Hydrogen and s - block Elements

Telangana Open School (TOSS) · Class 12 · Chemistry

Quick revision notes for Hydrogen and s - block Elements — Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Hydrogen: Position and Isotopes

  • Hydrogen has electronic configuration 1s¹ and resembles both alkali metals (ns¹) and halogens (gains one electron to form H⁻).
  • It is placed separately in the periodic table due to its unique behavior.
  • Three isotopes: Protium (¹H), Deuterium (²H or D), Tritium (³H or T).
2

Compounds of Hydrogen

  • Hydrides are binary compounds of hydrogen: ionic (e.g., NaH), covalent (e.g., CH₄), and metallic (e.g., LaH₂.₈₇).
  • Water (H₂O) is polar and forms hydrogen bonds; ice floats due to open cage-like structure.
  • Heavy water (D₂O) is used as a moderator in nuclear reactors.
3

s-Block Elements: Alkali Metals (Group 1)

  • General electronic configuration: ns¹.
  • Reactivity increases down the group due to decreasing ionization enthalpy.
  • Form +1 ions; compounds are mostly ionic.
4

s-Block Elements: Alkaline Earth Metals (Group 2)

  • General electronic configuration: ns².
  • Form +2 ions; reactivity increases down the group.
  • Less electropositive than alkali metals.

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Full Notes

Key Concepts

Hydrogen has a unique positionHydrogen has three isotopesHydrogen forms three types of hydridesAlkali metals (Group 1) have ns¹

Frequently Asked Questions

What are the important topics in Hydrogen and s - block Elements for Telangana Open School (TOSS) Class 12 Chemistry?
Hydrogen and s - block Elements covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Hydrogen and s - block Elements — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 46 practice questions available for this chapter. Revise formulas and 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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