p-Block Elements-I — Chapter Summary
Tamil Nadu Board · Class 12 · Chemistry
Summary of p-Block Elements-I for Tamil Nadu Board Class 12 Chemistry. Key concepts: p, The maximum oxidation state and Generally.
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Overview
The p-block elements form a fascinating and diverse group within the periodic table, comprising elements where the last electron enters the p-orbital. These elements (Groups 13-18) display remarkable variety in their properties, ranging from nonmetals like carbon and oxygen to reactive metals like a
Key Concepts
p
p-block elements have a general electronic configuration of ns² np¹⁻⁶. For example, boron is [He]2s²2p¹, carbon is [He]2s²2p², and nitrogen is [He]2s²
The maximum oxidation state (group oxidation
The maximum oxidation state (group oxidation state) equals the total number of valence electrons. Group 13 elements show +3, Group 14 shows +4, Group
Generally
Generally, ionization enthalpy decreases down a group due to increasing atomic radius. However, in p-block elements, there are deviations caused by po
In Group 13
In Group 13, electronegativity decreases from boron to aluminum, then marginally increases for gallium with no appreciable change thereafter. In other
Metallic character increases down a group
Metallic character increases down a group as ionization enthalpy decreases. In the p-block, the left side elements (boron, carbon, nitrogen) are nonme
Learning Objectives
- Understand the general electronic configuration and oxidation states of p-block elements
- Explain periodic trends in ionization enthalpy, electronegativity, and metallic character
- Describe anomalous properties of first-group members and the inert pair effect
- Study preparation, properties, and uses of boron and its important compounds
- Learn about carbon allotropes and significant carbon compounds (CO, CO₂)
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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