Name ______ Review of Quantum Mechanics

Name _______________________________ Review of Quantum Mechanics

1. This diagram shows the movement of electrons between energy levels.

n=4

n=2

a. i. Which arrows represent electrons moving to an excited state?

ii. Do these electrons gain or lose energy?

iii. Are these electrons moving closer to or further from the nucleus?

iv. If an instrument was used to measure the energy changes that took place during these movements, would it be an emission spectra or an absorption spectra?

b. i. Which arrows represent electrons moving to ground state?

ii. Do these electrons gain or lose energy?

iii. Are these electrons moving closer to or further from the nucleus?

iv. If an instrument was used to measure the energy changes that took place during these movements, would it be an emission spectra or an absorption spectra?

c. When excited the element represented here gives off a band of microwaves, ultraviolet, blue, infrared, purple and yellow lights. Which arrows are responsible for which of the absorptions?

d. Draw in another arrow that would represent an electron that would emit x-rays.

2. Shown below are the emission spectra for 5 known elements and for two unknown mixtures. The mixtures may have 1, 2 or 3 unknowns. Please try to identify the components of the two unknowns. Are there any other elements in either unknown other than the 5 known elements listed here? How could you tell?

H

B

He

Mg

Unknown 1

Unknown 2

Components of Unknown 1: ______________________________________________________________

Any other elements other than the 5 known elements and how do you know? _______________________________________________________________________________________

Components of Unknown 2: ______________________________________________________________

Any other elements other than the 5 known elements and how do you know? _______________________________________________________________________________________