Department of Chemistry

CARNEGIE MELLON UNIVERSITY

09-105 Introduction to Modern Chemistry

Quiz #2 (10 points, -1 each error) Name

Closed book, 10 minutes September 10, 1998

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 =2, m = 1, ms = 1/2 allowed

(b) n = 3, l = 1, m = 0, ms = -1/2 allowed

(c) n = 5, l = 1, m = 2, ms = 1/2 not allowed (m cannot be > l)

(d) n = 4, l = -1, m = 0, ms = 1/2 not allowed (ang. Mom. q.n. 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 = 3, l = 2 3d

(f) n = 7, l = 4 7g

(g) n = 5, l = 1 5p

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

(h) 3pz orbital none

(i) 4dx2-y2 orbital none

(j) 6dxy orbital A

(A)	(B)