Скачать или смотреть iupac name of elements greater than 100 | shielding effect chemistry class 11 | screening effect |

iupac name of elements greater than 100 | shielding effect chemistry class 11 | screening effect |

Welcome to the 4th lecture of our Periodic Classification of Elements series. In today's session, we transition from the history and structure of the periodic table to the technical and conceptual core of Inorganic Chemistry.
Mastering these topics is essential because they form the basis of "Effective Nuclear Charge" (Zeff), which determines almost every periodic trend you will study later—Atomic Radius, Ionization Energy, and Electronegativity.

📚 Recommended For: This lecture is mandatory for all Class 11, JEE, and NEET aspirants to build a strong conceptual base in Inorganic Chemistry, especially concerning exceptions and trends.

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📝 Core Concepts Covered in This Lecture:
1. IUPAC Nomenclature for Elements (Z more than 100):
Why did IUPAC need a systematic naming method for superheavy elements?
Learning the Latin roots for digits 0–9 (Nil, Un, Bi, Tri, Quad, Pent, Hex, Sept, Oct, Enn).
How to combine these roots with the suffix "ium" and derive the 3-letter official symbols.
Comparison of Systematic names with Discovery names (e.g., Mendelevium, Nobelium).

2. Prediction of Position in the Periodic Table:
Techniques to determine the Block, Period, and Group of any element using its atomic number.
Shortcuts for Z = 58 to 71 (Lanthanides) and Z = 90 to 103 (Actinides).

3. Shielding (Screening) Effect:
The "tug-of-war" inside an atom: Attraction by the nucleus vs. Repulsion by inner electrons.
Understanding the Screening Constant (sigma).
Why s-orbitals shield better than d and f orbitals (Penetration Power).

4. Effective Nuclear Charge (Zeff):The actual net positive charge experienced by a valence electron.
The formula: Zeff = Z - sigma.
Trends of Zeff in a Period vs. a Group.
Application in Isoelectronic Species: How to compare Zeff when electron counts are the same.

⏰ Timestamps for Easy Navigation:
00:00 - Introduction & Radhe Radhe!
01:03 - IUPAC Nomenclature for Elements with Z more than 100
01:26 - The 10 Root Words (Nil, Un, Bi, Tri...) & Abbreviations
02:17 - Step-by-Step Example: How to name Element 105
03:16 - Comparison Table: IUPAC Names vs. Official Names (101-110)
04:03 - Practice Exercise: Naming Elements 111 to 118
15:10 - Conceptual Introduction to Shielding (Screening) Effect
22:45 - The Attraction-Repulsion Balance in an Atom
30:15 - Inner Shell Electrons: The "Screen" Analogy
40:20 - Factors affecting Shielding Constant ($\sigma$)
45:10 - Effective Nuclear Charge (Zeff) Explained
48:35 - Relation between Atomic Size and Zeff
53:11 - Comparing Zeff in Isoelectronic Species (Cations & Anions)
54:10 - Preview: Calculating sigma using Slater’s Rules
54:25 - Summary & Conclusion

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💡 Pro-Tips for Students:
At [53:11], pay close attention to the relationship between positive charge and Zeff: this is a very common MCQ in JEE Mains.
Practice the IUPAC naming for elements 111-118; it’s an easy scoring area in Board exams.

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