Department of Chemistry

CARNEGIE MELLON UNIVERSITY

09-105 Introduction to Modern Chemistry

Quiz #2 Name

Closed book, 10 minutes January 28, 1999 -1 each error

Which of the following combinations of quantum numbers are allowed for an electron in a one-electron system and which are not?

(a) n = 3, l =3, m = 1, m_s = 1/2 Not allowed (l cannot be as large as n)

(b) n = 3, l = 3, m = 0, m_s = -1/2 Not allowed (")

(c) n = 5, l = 1, m = 2, m_s = 1/2 Not allowed (m cannot be larger than l)

(d) n = 4, l = -1, m = 0, m_s = 1/2 Not allowed (l cannot be negative)

For n = 1 and l = 0, the orbital would be labeled a "1s" orbital. Label the orbitals described by each of the following sets of quantum numbers.

(e) n = 4, l = 2 4d

(f) n = 6, l = 4 6g

(g) n = 3, l = 1 3p

Which of the figures below, A, B, or none, could be correctly used to describe a

(h) 3p_z orbital neither A nor B

(i) 3d_x2-_y2 orbital neither A nor B

(j) 6d_xy orbital B

(A)	(B)