JEE Main 2020 — Structure Of Atom Question with Solution
From: JEE Main 2020 (Online) 3rd September Evening Slot
Question
Consider the hypothetical situation where the
azimuthal quantum number,
, takes values 0,
1, 2, ....., n + 1, where n is the principal
quantum number. Then, the element with
atomic number :
Choose an option
Show full solutionCorrect option: A
Correct answer
A13 has a half-filled valence subshell
Step-by-step explanation
Under hypothetical situation, the value of l is
greater than n which varies from 0 to n + 1.
For n = 1, l = 0, 1, 2
n = 2, l = 0, 1, 2, 3
Elements follow the following electronic configuration
1s 1p 1d 2s 2p 2d 2f
Atomic number (Z) = 9
1s2 1p6 1d1
Atomic number = 6
1s2 1p4
Atomic number 8
1s2 1p6
Atomic number 13
1s2 1p6 1d5 (half filled)
For n = 1, l = 0, 1, 2
n = 2, l = 0, 1, 2, 3
Elements follow the following electronic configuration
1s 1p 1d 2s 2p 2d 2f
Atomic number (Z) = 9
1s2 1p6 1d1
Atomic number = 6
1s2 1p4
Atomic number 8
1s2 1p6
Atomic number 13
1s2 1p6 1d5 (half filled)
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This is a previous-year question from JEE Main 2020, covering the Structure Of Atom chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.