JEE MAIN - Chemistry (2020 - 3rd September Evening Slot - No. 14)
Consider the hypothetical situation where the
azimuthal quantum number,
$$l$$, takes values 0,
1, 2, ....., n + 1, where n is the principal
quantum number. Then, the element with
atomic number :
13 has a half-filled valence subshell
9 is the first alkali metal
8 is the first noble gas
6 has a 2p-valence subshell
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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