Chem. 105 Name:____________________________

Worksheet: Atoms and Formulas (10points)

1. Draw the electron arrangement for

Al

Br

Ca

2. Draw the Lewis electron dot symbols for:

Potassium Phosphorous

Tin Krypton

Argon Sodium

3. Calculate the formulas mass for Sucrose C₁₂H₂₂O₁₁

4. Calculate the percent composition of Calcium carbonate,CaCO₃

5. Calculate the percent composition of C₈H₁₈