Chemistry lab

Lab 5 Electron Configuration CHEM101L

Student Name: Andrew Webster Access Code (located on the lid of your lab kit):

Pre-Lab Questions

1. What is electron configuration?

2. How is the light emitted by an atom related to its electron configuration?

Data

Table 1: Results of firework material ignition

Substance	Observations
Lithium Chloride	The Flame turned Red
Sodium Chloride	The flame turned yellow
Potassium Chloride	The flame turned slightly purple
Calcium Chloride	The flame turned orange

Post-Lab Questions

1. Write out the electron configurations for each of the following elements. Potassium is already done as an example for you. HINT: The periodic table is very helpful and can be used as a guide.

Element	Electron Configuration
K	1s22s22p63s23p64s1
Li	1s^2 2s^1
Na	1s^2 2s^2 2p^6 3s^1
Ca	1s2 2s2 2p6 3s2 3p6 4s2

2. What is the approximate wavelength of light emitted by each of the salts?

Salt	Color	Wavelength
LiCl	Red	700nm
NaCl	Yellow	590nm
KCl	Purple	450nm
CaCl2	Orange	635nm

3. Why does a salt compound give off light or a colored flame when burned?

4. Did sodium chloride and potassium chloride give off similar colors? Why or why not?

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