Part One: Elements

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This activity will be like a mini-lab: you will collect data from the periodic table, perform calculations, and draw conclusions based on your results. After you have completed the activity and questions on this page, move on to Part Two: Compounds. You will do all your work on the worksheet that accompanies this page.

Directions

1. Print the worksheet for this assignment(Your instructor may provide you with a photocopy).
2. Look up the atomic number and atomic mass of the elements in the data table. Write them in the blocks, rounding the atomic masses to the nearest whole number (i.e.: 39.948 rounds to 40).
3. To use the ATOMIC CALCULATOR choose and element and enter a value in the box under "Mass(g)." You do not have to enter the symbol for grams. Then hit the calculate button to calculate the number of atoms in that mass of the element.
4. Keep trying different values for the mass until you obtain the mass that contains 6.02 X 10²³ atoms. Then obtain the masses that contain 3.02 X 10²³ atoms and 12.04 X 10²³ atoms. Remember to record all of your results in the chart.

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Data Table and Atomic Calculator

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Element	Atomic #	Atomic Mass	Grams containing 6.02 X 1023 atoms	Grams containing 3.01 X 1023 atoms	Grams containing 12.04 X 1023 atoms
Hydrogen
Helium
Argon
Potassium
Uranium

ATOMIC CALCULATOR
Choose an element	Mass (g)	# of atoms
Hydrogen       Helium       Argon       Potassium       Uranium		X 1023

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Questions

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1. For each element, was the grams that contained 6.02 X 10²³ atoms related to the the atomic number or the atomic mass? Explain.





2. How did the grams that contained 3.01 X 10²³ and 12.04 X 10²³ compare to the atomic mass?





3. How many grams would be needed to obtain 6.02 X 10²³ atoms of Sulfur?





4. What does the atomic mass really tell us?

Now do Part Two