Verified Solution • 2025–26 Session moderate

QJEEM20Ch51c6: JEE Main 2020 Chemistry - Class 11 JEEM20Ch51c6 Solution: Consider the hypothetical situation where the azimuthal quantum …

Consider the hypothetical situation where the azimuthal quantum number, ll , takes values 0, 1, 2, ....., n + 1, where n is the principal quantum number. Then, the element with atomic number :

Multiple Choice Options

  • A 13 has a half-filled valence subshell
  • B 9 is the first alkali metal
  • C 8 is the first noble gas
  • D 6 has a 2p-valence subshell

Step-by-Step Verified Solution

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)

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