90% Choose Group 1 for Unununium! (JEE Main 2024) | Ex-Allen Aakash Narayana Faculty

Are you also one of those students who think that "Unununium" (atomic number 111) belongs to Group 1 of the periodic table because it starts with 1? If yes, you might be falling right into a classic IUPAC nomenclature trap from JEE Main 2024!

In this quick video, Nishant Sir explains how to decode IUPAC systematic names for elements with Z greater than 100, and shows you two quick methods (noble gas reference and magic numbers) to determine the exact group of any superheavy element in the periodic table.

📌 Timestamps:
00:00 - Introduction & The IUPAC Naming Trap (90% fail rate)
00:43 - Deciphering the Atomic Number of "Unununium" (111)
01:43 - Periodicity & Magic Numbers Explanation for Group 13
03:24 - Using Nihonium (113) to Locate Copernicium (112) and Roentgenium (111)
03:58 - Direct Magic Number Application for Group 11
05:00 - Final Group and Period Assignment for Element 111

🔍 Search Keywords / Exact Question Text:
"If IUPAC name of an element is unununium, then the element belongs to n-th group of periodic table. The value of n is:
Option A: 1
Option B: 12
Option C: 2
Option D: 11"

📝 Key Concepts Covered:
1. IUPAC Systematic Naming for Elements:
- Root words for digits: 0 = nil, 1 = un, 2 = bi, 3 = tri, 4 = quad, 5 = pent, 6 = hex, 7 = sept, 8 = oct, 9 = enn.
- For "unununium": un (1) + un (1) + un (1) + ium = element 111.

2. Group Determination Methods:
- Method 1 (Noble Gas Reference): The 7th period ends at the noble gas Oganesson (Og, Z = 118) in Group 18. Counting backward:
- Z = 118 is Group 18
- Z = 117 is Group 17
- Z = 116 is Group 16
- Z = 115 is Group 15
- Z = 114 is Group 14
- Z = 113 is Group 13
- Z = 112 is Group 12
- Z = 111 is Group 11 (Roentgenium, Rg).
- Method 2 (Magic Numbers / Congeners): Group 11 (coinage metals) contains Copper (Cu, Z = 29), Silver (Ag, Z = 47), Gold (Au, Z = 79). Adding the period 6-to-7 magic number 32 to Gold: 79 + 32 = 111. Thus, element 111 is the next member of Group 11.

💡 Nishant Sir's Pro-Tip:
Don't fall for the visual trick where "Unununium" (111) has three '1's, causing you to rush and choose Group 1! Always write down the atomic number first (111) and reference it against the nearest noble gas (Oganesson, 118 in Group 18) or use magic numbers to find the correct group. Taking 10 extra seconds to verify will save you from negative marking!

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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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