TITLE: Ex-Allen Aakash Narayana Faculty: The Atomic vs Ionic Radius Trap - Group 13 - JEE/NEET

QUESTION SOLVED IN THIS VIDEO
Comparison of Atomic Radius vs. Ionic Radius for Aluminum (Al) and Gallium (Ga).
(Focusing on the NTA trap: Confusing atomic trends with ionic trends).

THE TRAP
The "Consistency" Trap. Students often memorize one trend for an element and apply it blindly. NTA tests your depth: In neutral atoms, Ga less than Al (due to poor shielding of 3d10). However, in +3 ions, Ga3+ --- Al3+ (due to the presence of an extra inner shell).

THE COACHING METHOD
1. Atomic Radius Logic: Ga has 3d10 electrons, which have poor shielding. This increases Z-effective, making Ga smaller than Al.
2. Ionic Radius Logic: Al3+ and Ga3+ have lost 3 electrons. Ga3+ retains an extra inner shell compared to Al3+, making Ga3+ larger.
3. Key Takeaway: Never assume the atomic trend automatically applies to the ionic state.

TIMESTAMPS
00:01 The Aluminum vs. Gallium Size Error
00:17 Analyzing Atomic Radius (Why Ga Al)
01:55 Analyzing Ionic Radius (Why Ga3+ Al3+)
02:27 The role of the "Extra Inner Shell"
03:54 Actual Data (54 pm vs 62 pm)
04:04 Final Conclusion: Statement 1 False, Statement 2 True

ABOUT ME
Nishant Ex-Faculty at Allen Aakash and Narayana. Founder of Quantum Chemistry Classes Arrah Bihar.

COMMON MISTAKES
- Applying the "poor shielding" logic to ions when the subshell structures have changed.
- Assuming the atomic radius order must match the ionic radius order.
- Forgetting that Z-effective increases for both, but the shell count dictates ion size.

#JEEMain #NEET #AtomicStructure #PeriodicTrends #ChemistryPYQ #NishantSir #QuantumChemistryClasses #AraBihar #InorganicChemistry #IonicRadius #AtomicRadius

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