Скачать или смотреть Lanthanoid Contraction Explained | f-Block Chemistry Class 12 | JEE/NEET | Part 8

Welcome to Part 8 of the Transition Elements Series!
In this lecture, we break down one of the MOST important & misunderstood concepts in Class 12 Chemistry —
👉 The Lanthanoid Contraction

Lanthanoid contraction affects atomic radii, ionic sizes, oxidation states, hydration enthalpies, charge density, basicity… even the chemistry of transition metals like Zr and Hf.
This video makes everything super easy to understand.

🔥 Topics Covered in This Lecture
1️⃣ What is Lanthanoid Contraction?

Continuous decrease in size (Ce → Lu)

Reason: Poor shielding by 4f electrons

Increase in effective nuclear charge

2️⃣ Why Does It Matter? (Consequences)

Zr & Hf almost same size (Exam favourite!)

Difficulty in separating lanthanoids

Higher charge density

Hydration enthalpy increases

Basicity of Ln(OH)₃ decreases

Slight increase in melting/boiling points

Stronger complex formation for heavy lanthanoids

3️⃣ Trends Affected

Ionic radii

Atomic radii

Basicity

Colour & magnetism

Oxidation state stability

4️⃣ Quick MCQs + Assertion–Reason

Perfect for Boards + NEET + JEE revision.

🎓 From EgPadhai × Brain Booster Academy

Free Education For Every Student — Sab Seekhenge, Sabko Sikhana Hamara Lakshya.

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