Match column I (set of quantum number) with column II (number electrons present/representation of electron)
Quantum number Number of electrons present/representation of electron
A
number of electrons in an atom with
n = 4; m_s = $- \frac{1}{2}$
I valence electron of K
B
number of electrons in an atom with
n = 3; l = 0
II 6 electrons
C n = 4;l = 0;m_l=0;m_s= $\pm \frac{1}{2}$ III valence electron of B
D n=2;l=1;m_l=0, $\pm$ 1;m_s= $\pm \frac{1}{2}$ IV 2 electrons
V 16 electrons

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A	B	C	D
V	IV	III	I

A	B	C	D
V	IV	I	III

A	B	C	D
IV	V	III	I

A	B	C	D
I	II	III	IV

answer is B.

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Detailed Solution

	Quantum number		Number of electrons present/representation of electron
A	number of electrons in an atom with n = 4; m_s = $- \frac{1}{2}$	V	16 electrons
B	number of electrons in an atom with n = 3; l = 0	IV	2 electrons
C	n = 4;l = 0;m_l=0;m_s= $\pm \frac{1}{2}$	I	valence electron of K
D	n=2;l=1;m_l=0, $\pm$ 1;m_s= $\pm \frac{1}{2}$	III	valence electron of B