Question

Question 2.30 Explain, giving reasons, which of the following sets of quantum numbers are not possible.




an = 0l = 0 ml = 0 ms=+1/2


bn = 1l = 0 ml = 0 ms=-1/2


cn = 1l = 1 ml = 0 ms=+1/2


dn = 2l = 1 ml = 0 ms=-1/2


en = 3l = 3 ml = – 3 ms=+1/2


fn = 3l = 1 ml = 0 ms=+1/2

Class XI Structure of Atom Page 66

Answer 1

a) The given set of quantum numbers is not possible because the value of the principal quantum number (n) cannot be zero.

 

(b) The given set of quantum numbers is possible.

 

(c) The given set of quantum numbers is not possible when n = 1, l is not equal to 1

 

(d) The given set of quantum numbers is possible.

 

(e) The given set of quantum numbers is not possible when n = 3 ,l = is not equal to 3

 

(f) The given set of quantum numbers is possible

Answer 2

concept : (1)principal quantum number ≠ azimuthal quantum number. e.g., n ≠ l
(2)principal quantum number always be a positive integer.e.g., n ≠ 0


(a) it's not possible because n ≠ 0
(b) it's possible.
(c)it's not possible because if n = 1 then, l = 0 but here l = 1 .
(d) it's possible .
(e) it's not possible because if n = 3 then, l = 0, 1, 2 but here l = 3 .
(f) it's possible .