Question

Consider the following sets of quantum number

	n	l	m	s
(i)	3	0	0	$+1/2$
(ii)	2	2	1	$+1/2$
(iii)	4	3	$-2$	$-1/2$
(iv)	1	0	$-1$	$-1/2$
(v)	3	2	3	$+1/2$

Which of the following sets of quantum number is not possible?

• A. (i), (ii), (iii) and (iv)
• B. (ii), (iv) and (v)
• C. (i) and (iii)
• D. (ii), (iii) and (iv)

Answer 1

Answer: (B)

$(i)$ represents an electron in 3s orbital.
$(ii)$ is not possible as value of l varies from 0, 1, .... (n - 1).
$(iii)$ represents an electron in 4f orbital.
$(iv)$ is not possible as value of m varies from $-l\dots +l.$
$(v)$ is not possible as value of m varies from $-l\dots +l,$ it can never be greater than l.