Answers - Electronic Structure

Arkansas State University
Department of Chemistry
and Physics

Answers

Electronic Structure

1.	complete electronic configuration	abbreviated electronic config.	valence electrons
a) Fe	1s²2s²2p⁶3s²3p⁶4s²3d⁶	[Ar]4s²3d⁶	2
b) Er (aufbau)	1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²5d¹4f¹¹	[Xe]6s²5d¹4f¹¹	2
(mnemonic)	1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s²4f¹²	[Xe]6s²4f¹²	2
c) Se	1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴	[Ar]4s²3d¹⁰4p⁴	6
d) Cs	1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s¹	[Xe]6s¹	1
e) Ag	1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s¹4d¹⁰	[Kr]5s¹4d¹⁰	1

2. Draw the complete energy level diagram for Mo and describe its magnetic properties.

3. Describe a possible set of quantum numbers for the 6th, 22nd, 44th and 80th electrons in mercury. Using the Aufbau Principle

6th - 2,1,0,+1/2

22nd - 3,2,1,+1/2

44th - 4,2,2,-1/2

80th - 5,2,-2,-1/2

4. Classify each of the following elements (based on their electronic configuration).

As - Representative Ru - Transition

Cu - Transition Cm - Inner Transition

5. Determine the electronic configuration and draw the expected orbital for each of the following sets of quantum numbers.

3,1,-1,+½ - 3p³ 5,0,0,-½ - 5s²

2,1,0,+½ - 2p² 4,2,-2,-½ - 4d¹⁰

As - Representative	Ru - Transition

Cu - Transition	Cm - Inner Transition

3,1,-1,+½ - 3p³	5,0,0,-½ - 5s²

2,1,0,+½ - 2p²	4,2,-2,-½ - 4d¹⁰