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Elements of Group 1 and 2

Maharashtra Board · Class 11 · Chemistry

Quick revision notes for Elements of Group 1 and 2 — Maharashtra Board Class 11 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

8.1 Hydrogen - The Unique Element

  • Hydrogen has the simplest atomic structure with one proton and one electron
  • Electronic configuration: 1s¹ (similar to both Group 1: ns¹ and Group 17: ns²np⁵)
  • Three isotopes: Protium (¹H), Deuterium (²H or D), and Tritium (³H or T)
2

8.2 Group 1 Elements - Alkali Metals

  • Elements: Li, Na, K, Rb, Cs, Fr (Fr is radioactive)
  • Electronic configuration: [noble gas] ns¹
  • Most electropositive elements with lowest ionization enthalpies
3

8.3 Group 2 Elements - Alkaline Earth Metals

  • Elements: Be, Mg, Ca, Sr, Ba, Ra (Ra is radioactive)
  • Electronic configuration: [noble gas] ns²
  • Form divalent cations (M²⁺) with inert gas configuration
4

8.4 Diagonal Relationship

  • Li resembles Mg (diagonal relationship across periods 2-3)
  • Be resembles Al (diagonal relationship across periods 2-3)
  • Due to similar charge/size ratios and polarizing power

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Full Notes

Key Concepts

Group 1 elements have ns¹ configurationHydrogen has three isotopesDown both groupsBoth groups are highly reactive dueLi resembles Mg

Frequently Asked Questions

What are the important topics in Elements of Group 1 and 2 for Maharashtra Board Class 11 Chemistry?
Elements of Group 1 and 2 covers several key topics that are frequently asked in Maharashtra Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Elements of Group 1 and 2 — Maharashtra Board Class 11 Chemistry?
Understand the core concepts first, then work through the 45 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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