The p-Block Elements – Class 12 Chemistry Notes | Group 15, 16, 17, 18 Full Summary

 🌈 Chapter 7: The p-Block Elements



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🔹 Introduction


p-block elements = Elements of group 13 to 18


Class 12 me: Group 15, 16, 17, 18


Their outermost electron enters the p-orbital




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🧪 Group 15 Elements – Nitrogen Family


Element Symbol Atomic No.


Nitrogen N 7

Phosphorus P 15

Arsenic As 33

Antimony Sb 51

Bismuth Bi 83



Important Compounds:


Ammonia (NH₃)


Nitric acid (HNO₃)


Phosphine (PH₃)


Oxides of nitrogen



📌 Diagram: Structure of nitric acid, hybridisation in NH₃



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🔹 Group 16 Elements – Oxygen Family (Chalcogens)


Element Symbol Atomic No.


Oxygen O 8

Sulfur S 16

Selenium Se 34

Tellurium Te 52

Polonium Po 84



Important Compounds:


O₃ (Ozone)


SO₂, SO₃


H₂SO₄ – industrially important



📌 Diagram: Contact process (H₂SO₄ manufacturing), ozone structure



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🔹 Group 17 Elements – Halogens


Element Symbol


Fluorine F

Chlorine Cl

Bromine Br

Iodine I

Astatine At



Important Compounds:


Hydrochloric acid (HCl)


Interhalogen compounds


Chlorine water reactions



📌 Diagram: Structures of ClF₃, IF₇



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🔹 Group 18 Elements – Noble Gases


Element Symbol


Helium He

Neon Ne

Argon Ar

Krypton Kr

Xenon Xe

Radon Rn



Properties:


Inert, monoatomic gases


High ionization enthalpy


Used in neon lights, arc welding



Xenon Compounds:


XeF₂, XeF₄, XeF₆


Noble gases form compounds only under specific conditions.



📌 Diagram: Shape of XeF₂ (linear), XeF₄ (square planar), XeF₆ (distorted octahedral)



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🔹 Important Concepts:


Oxidation states and anomalous properties of first elements


Inert pair effect


Bonding nature, acid-base character


Manufacturing reactions like Ostwald, Contact, Haber process




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🖼️ Important Diagrams to Include:


1. Structure of NH₃, HNO₃



2. Contact process setup



3. Ozone molecular structure



4. Shapes of Xe compounds (XeF₂, XeF₄, XeF₆)



5. Halogen interhalogen compounds




6. Group-wise trends chart



7. Periodic table highlighting p-block





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✍️ Written by: Shahid – Study with Shahid

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