pre-lab questions

1. What is an electron configuration?

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

experiment 1 data sheet

Table 2: Results of Firework Material Ignition

    

Substance

Observations

 

Lithium chloride (LiCl) 

Sodium chloride (NaCl) 

Potassium chloride (KCl)

Calcium chloride (CaCl2)

Table 3: Electron Configuration

    

Element

Electron Configuration

 

K

 

Li

 

Na

 

Ca

1s2 2s2 2p6 3s2 3p6 4s2

Table 4: Color of Light Emitted by Salt Types

    

Salt

Color

Wavelength

 

LiCl

 

NaCl

Yellow –colored flame

589nm

 

KCl

Pink-colored flame

766nm

 

CaCl2

Orange 

Between    591-603nm

   Post-Lab Questions

1. Write out the electron configurations of carbon and each of the metals of the salt compounds used. Record this in Table 3. Potassium is already done as an example for you. Hint: The periodic table is very helpful and can be used as a guide.

2. Identify the color emitted by each of the salts along with the corresponding approximate wavelength using Table 1 in the Introduction. Record your results in Table 4.

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

4. Barium chloride (BaCl2) emits a green color when flame-tested. What can be said about the wavelength of light it emits? 

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