Скачать или смотреть slater's rule | slater's rule class 11 | shielding constant calculations | valency of elements |

slater's rule | slater's rule class 11 | shielding constant calculations | valency of elements |

In our previous lecture, we understood what the Shielding Effect and Effective Nuclear Charge (Zeff) are. But in competitive exams like JEE Mains, Advanced, and NEET, you aren't just asked for definitions—you are asked for calculations.

Today’s lecture is dedicated to Slater’s Rules—the mathematical framework used to calculate the Screening Constant (sigma). We also start our journey into "Periodicity in Properties" by decoding the difference between Valency, Electrovalency, Covalency, and Oxidation Number.

📚 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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📝 What You Will Learn in This Deep-Dive Lecture:
1. Mastering Slater's Rules [00:54]
The Grouping Rule: Why we must write configurations in a specific order
(e.g., (1s), (2s, 2p), (3s, 3p), (3d)...).

Calculating sigma for s and p electrons:
Same shell (n) contribution: 0.35 (Special case for Helium: 0.30).
(n-1) shell contribution: 0.85.
Inner shells (n-2) and below: 1.00.

Calculating sigma for d and f electrons: Why the rules change for these orbitals.

2. Effective Nuclear Charge (Zeff) Calculations [04:32]
How to apply the formula: Zeff = Z - sigma.
Detailed walkthrough using Sodium (Na) as an example.
The "Self-Repulsion" Myth: Why we never count the electron we are calculating for in the repulsion total.

3. Periodicity: Valency & Oxidation States [50:00]
Valency vs. Valence Electrons: Clearing the common confusion.
Covalency: For covalent compounds (Example: CH4, NH3).
Electrovalency: For ionic compounds (Example: NaCl, MgCl2).
Oxidation Number: Why signs (+ or -) matter here, but NOT in valency [56:19].

⏰ Timestamps for Revision:
00:00 - Introduction & Radhe Radhe!
00:15 - Recap: Screening Effect & Effective Nuclear Charge (Zeff)
00:54 - Calculation of Sigma by Slater's Rules
01:08 - Step 1: Specific Grouping of Electronic Configuration
02:10 - Step 2: Electron Contribution Values (0.35, 0.85, 1.00)
04:32 - Full Example: Calculating Zeff for Sodium (Na)
15:20 - Specific Rules for d and f Block Electrons
30:00 - Solved Practice Problems on Slater’s Rules
50:10 - Periodicity in Properties: Valency vs. Valence Electrons
53:00 - Understanding Electrovalency (Ionic Bonds)
55:00 - Understanding Covalency (Covalent Bonds)
56:19 - Comparison: Valency vs. Oxidation Number (The Sign Difference)
57:42 - Conclusion & Next Class Preview: Atomic Radii

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💡 Pro-Tip for JEE/NEET Aspirants:
The difference between Valency and Oxidation Number explained at [56:19] is a classic "trap" question in exams. Remember: Valency is just a magnitude (a number), while Oxidation State includes the nature of the charge (+ or -).

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