🧪 CET Chemistry – Periodic Table Trends (Concept + Short Notes) By Sarthak Patil

 🔹 Introduction:


Periodic Table ही Chemistry ची Foundation आहे. त्यातील Periodic Trends समजून घेतले, की MCQs सोडवणं खूप सोपं होतं. चला बघूया मुख्य trends एकदम सोप्या भाषेत.

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📘 1. Atomic Radius (परमाणु त्रिज्या)


Left to Right (→): कमी होते


Top to Bottom (↓): वाढते

📌 Reason: Nuclear charge वाढतो → electrons जास्त attract होतात → size कमी

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📗 2. Ionization Energy (IE)


→: वाढते


↓: कमी होते

📌 Reason: छोटं atom = electrons घट्ट धरलेले → जास्त energy लागते

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📙 3. Electron Affinity (EA)


→: वाढते


↓: कमी होते

📌 Cl ला highest EA – कारण त्याला electron add करायला आवडतं

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📕 4. Electronegativity (EN)


→: वाढते


↓: कमी होते

📌 F (Fluorine) ला highest EN – तो electrons खूप जोरात खेचतो

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🧠 Extra Trends:


Trend Across Period (→) Down Group (↓)


Atomic Radius ⬇ Decreases ⬆ Increases

Ionization Energy ⬆ Increases ⬇ Decreases

Electronegativity ⬆ Increases ⬇ Decreases

Electron Affinity ⬆ Increases ⬇ Decreases

Metallic Character ⬇ Decreases ⬆ Increases

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🔎 Important Points:


Group 1 (Alkali Metals): Highly reactive


Group 17 (Halogens): Highest EA and EN


Group 18 (Noble Gases): Stable, full octet


d-block (Transition Elements): Variable valency

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✅ Conclusion:


Periodic Table Trends लक्षात ठेवायला visual charts + comparisons फार उपयुक्त ठरतात. प्रत्येक trend चं कारण समजून घेतलं की, conceptual clarity मिळते आणि trick वाचून MCQ solve करता येतात.


📌 Revise हे trends वेळोवेळी आणि use short codes to memorize!

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📖 More Chemistry Short Notes coming soon!

Follow Sarthak’s Education Corner for regular CET tricks & formulas.


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