Elements of Group 1 and 2
Maharashtra Board · Class 11 · Chemistry
Summary of Elements of Group 1 and 2 for Maharashtra Board Class 11 Chemistry. Key concepts, important points, and chapter overview.
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Overview
This chapter explores the s-block elements of the periodic table, focusing on hydrogen, alkali metals (Group 1), and alkaline earth metals (Group 2). These elements are characterized by their outer electronic configurations of ns¹ and ns² respectively, making them highly reactive metals with signifi
Key Concepts
Group 1 elements have ns¹ configuration
Group 1 elements have ns¹ configuration (except H with 1s¹) while Group 2 elements have ns² configuration. This determines their chemical behavior - G
Hydrogen has three isotopes
Hydrogen has three isotopes: Protium (¹H), Deuterium (²H or D), and Tritium (³H or T). Despite being placed in Group 1, hydrogen shows unique properti
Down both groups
Down both groups: atomic radius increases, ionization enthalpy decreases, electronegativity decreases, metallic character increases. Group 2 elements
Both groups are highly reactive due
Both groups are highly reactive due to low ionization enthalpies. Reactivity increases down the group. Common reactions include: with oxygen (forming
Li resembles Mg
Li resembles Mg, and Be resembles Al due to similar charge-to-size ratios. This anomalous behavior results in similar properties like forming covalent
Learning Objectives
- Understand the position and electronic configuration of s-block elements
- Learn about hydrogen isotopes and their unique properties
- Compare properties and reactivity trends within Group 1 and Group 2
- Study preparation methods and chemical reactions of these elements
- Understand diagonal relationships between Li-Mg and Be-Al
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