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Worksheet 11 . Topic 3

Set D: Bright-line spectra Objective: To test your ability to analyze bright-line spectra chart

Below, bright-line spectral chart for five elements and four unknown samples are given.
Answer questions 17 - 21 based on the information given in the chart.

7500 7000 6500 6000 5500 5000 4500 4000
-10
wavelength: A (10 m)
Lithium (Li)
Sodium (Na)
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Helium (He)

Potassium(K)
Cadmium(Cd)

Hydrogen (H)

Teacher Preview Copy Unknown W

Unknown X

Unknown Y

Unknown Z

17. List all elements present in unknown sample W .

18. List all elements present in unknown sample X .

19. List all elements present in unknown sample Y.

20. List all elements present in unknown sample Z.

21. Explain, in terms of electron transition, how bright-line spectra are produced by atoms.

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