95% Fail this Configuration Match Trap! (JEE Main 2024) | Ex-Allen Aakash Narayana Faculty

Are you also one of those students who think electrons are removed from 3d orbitals before 4s orbitals when forming transition metal cations? If yes, you might be falling right into a classic d-block electronic configuration trap from JEE Main 2024!

In this quick video, Nishant Sir breaks down the ionization of chromium, manganese, nickel, and vanadium, explaining the key rules of electron removal from s and d orbitals, helping you secure that +4 marks easily.

📌 Timestamps: 00:00 - Introduction & The Configuration Match Trap (95% fail rate) 00:20 - Ground State Configuration of Cr, Mn, Ni, and V 02:59 - Orbital Energy Levels & Electron Removal Rules (4s vs. 3d) 03:37 - Deducing Configuration of Cr2+ and Mn+ 04:44 - Deducing Configuration of Ni2+ and V+ 05:55 - Matching the Columns & Verification of Correct Option

🔍 Search Keywords / Exact Question Text: "Match List I with List II: List I (Species): (A) Cr2+ (B) Mn+ (C) Ni2+ (D) V+ List II (Electronic Configuration): (I) 3d8 (II) 3d3 4s1 (III) 3d4 (IV) 3d5 4s1 Choose the correct answer from the options given below:"

📝 Key Concepts Covered:

Ground State Configurations:

Chromium (Cr, Z = 24): [Ar] 3d5 4s1 (due to extra stability of half-filled d-subshell).
Manganese (Mn, Z = 25): [Ar] 3d5 4s2.
Nickel (Ni, Z = 28): [Ar] 3d8 4s2.
Vanadium (V, Z = 23): [Ar] 3d3 4s2.
Cation Ionization Rule:

When transition metal atoms form ions, electrons are lost first from the outermost shell orbital (highest principal quantum number n).
Therefore, electrons are removed from the 4s orbital first, before any electrons are removed from the 3d orbital.
Electronic Configurations of Cations:

Cr2+ (loses 2 electrons: 1 from 4s, 1 from 3d): [Ar] 3d4. (Matches III)
Mn+ (loses 1 electron from 4s): [Ar] 3d5 4s1. (Matches IV)
Ni2+ (loses 2 electrons from 4s): [Ar] 3d8. (Matches I)
V+ (loses 1 electron from 4s): [Ar] 3d3 4s1. (Matches II)
💡 Nishant Sir's Pro-Tip: The most common mistake students make in transition metal chemistry is applying the Aufbau principle in reverse when removing electrons. Remember, during ionization, electrons always leave the orbital with the highest principal quantum number (4s) first, even if it was filled before 3d! Memorizing this simple rule will prevent you from falling into these electronic configuration traps and secure you easy marks.

🎯 About Padho Likho JEE & Quantum Chemistry Classes: We focus on teaching you the "why" behind physical and inorganic chemistry concepts and helping you avoid common exam traps. Led by Nishant Sir (ex-faculty Aakash, Allen, Narayana), we bring top-tier preparation straight to you.

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