Factors Affecting Atomic Radius, Isoelectronic Species & Electronegativity | Periodic Trends | NEET

Master the key periodic trends in this detailed session of Classification of Elements and Periodicity in Properties (Part 8). This video covers everything you need to know about the factors governing atomic size, size comparisons in isoelectronic species, and Pauling's electronegativity scale—essential for Class 11 exams, NEET, and JEE. Timestamps / Key Topics Covered: – Introduction & Overview – Factors Affecting Atomic Radius (Z_{\text{eff}}, Number of Shells n, Bond Order) – Periodic Trends in Atomic Radius (Down a Group vs. Across a Period) – Understanding Isoelectronic Species & Ionic Radius (Cation vs. Anion) – Solved Examples: Arranging Species by Increasing Size (N^{3-}, O^{2-}, F^-, Na^+, Mg^{2+}, Al^{3+}) – Electronegativity Fundamentals & The "FON" Rule – Pauling Scale of Electronegativity & Resonance Energy Formulas Key Takeaways & Formulas: Covalent Radius {Bond Order}} Isoelectronic Size Rule: Atomic size decreases with increasing positive charge and increases with increasing negative charge. Pauling Electronegativity Equation: For bond energies in {kcal/mol}: X_A - X_B = 0.208 \times (\Delta E)^{1/2} For bond energies in {kJ/mol}: X_A - X_B = 0.088 \times (\Delta E)^{1/2} 🎯 Target Exams: •NEET 2027 • RPSC 2nd Grade (Science / सामान्य विज्ञान) • Lab Assistant (प्रयोगशाला सहायक) • REET / State TET Science •UPSC and STATE PCS exams • Other State & Central Competitive Exams ━━━━━━━━━━━━━━━━━━━━━━━━━━ 📂 Important Playlists: ▶️ Physics Complete Theory & MCQs: ▶️ Chemistry Complete Classes:   • Chemistry   ▶️ Biology Special Series: ▶️ Lab Assistant & 2nd Grade Practice Sets: 📢 फ्री क्लास नोट्स और PDF के लिए जुड़ें: 📱 Telegram Channel: https://t.me/GrayMatterScience ━━━━━━━━━━━━━━━━━━━━━━━━━━ ⭐ चैनल को Subscribe करें और Bell Icon जरूर दबाएं ताकि कोई भी क्लास छूटे न! Like 👍 | Share 🔄 | Subscribe 🔔 KEYWORDS:- periodic classification of elements class 11 ​factors affecting atomic radius ​effective nuclear charge class 11 ​isoelectronic species class 11 chemistry ​electronegativity class 11 chemistry ​pauling scale of electronegativity atomic radius periodic trends atomic size across period and down group cation and anion size comparison isoelectronic species size order questions bond order and covalent radius relation pauling electronegativity formula ionic resonance energy formula most electronegative element FON rule alkali metals atomic radius maximum reason inert gas van der waals radius trend #Class11Chemistry #PeriodicClassification #AtomicRadius #Electronegativity #NEETChemistry #JEEMains #chemistrylecture #GrayMatterScience #ScienceClasses #RPSC2ndGrade #2ndGradeScience #RPSC #LabAssistant #GeneralScience #PhysicsInHindi #ChemistryInHindi #BiologyInHindi #OnlineClasses #ScienceForGovtExams #2ndGradeScience #SciencePlusbiology #SciencePlusPhysics #SciencePluschemistry