Building the Periodic Table
Pre-Lab Questions:
1.) What is an element? How many different kinds of atoms is any element made of?
2.) What is the atomic mass of an element?
3.) What is the atomic number of an element?
4.) How many atoms of each element are present in the molecules of the following compound?
a.)HCL
b.)H2O
1.) What is an element? How many different kinds of atoms is any element made of?
2.) What is the atomic mass of an element?
3.) What is the atomic number of an element?
4.) How many atoms of each element are present in the molecules of the following compound?
a.)HCL
b.)H2O
Procedure:
For this lab, we worked in a group of four to try and create a periodic table to group and
For this lab, we worked in a group of four to try and create a periodic table to group and
Post-Lab Questions:
1.) How many groups or families of elements are in your table?
2.) What criteria did you use to choose which groups or family an element belongs to?
3.) Is there a trend in atomic mass going across your table? Is there a trend in atomic mass going from top to bottom?
4.) Are there any exceptions to these trends? If so, which elements break the trend? Why did you arrange these elements the way you did?
5.) Are there any holes or gaps in your arrangement? Where are they? What do you think these gaps might mean?
1.) How many groups or families of elements are in your table?
2.) What criteria did you use to choose which groups or family an element belongs to?
3.) Is there a trend in atomic mass going across your table? Is there a trend in atomic mass going from top to bottom?
4.) Are there any exceptions to these trends? If so, which elements break the trend? Why did you arrange these elements the way you did?
5.) Are there any holes or gaps in your arrangement? Where are they? What do you think these gaps might mean?
Extension Questions:
1.) After you prepared your periodic tables, your teacher gave you additional sets of card to fit into your tables. How did your table change each time you added new elements to your table?
2.) How is your table similar to a modern periodic table? How is it different to the modern periodic table?
3.) How do we explain today the fact that tellurium comes before iodine in the periodic table, even though tellurium has a higher atomic mass than iodine?
4.) Mendeleev predicted the existence of gallium and germanium because of the holes in his periodic table. Why do you think Medeleev did not predict the existence of the noble gases?
5.) Look at a modern periodic table. Suppose two new elements were discovered with the atomic numbers 120 and 121. Where in the periodic table do you think we would place these new elements?
6.) Suppose a new element X is discovered. It forms a compound with chlorine, and the formula of this compound is XCI4. What group or family do you think this element would belong to?
7.) Find the element barium (Ba) on a modern periodic table. What group or family is barium in? What do you think the formula of a compound of barium and chlorine would be?
1.) After you prepared your periodic tables, your teacher gave you additional sets of card to fit into your tables. How did your table change each time you added new elements to your table?
2.) How is your table similar to a modern periodic table? How is it different to the modern periodic table?
3.) How do we explain today the fact that tellurium comes before iodine in the periodic table, even though tellurium has a higher atomic mass than iodine?
4.) Mendeleev predicted the existence of gallium and germanium because of the holes in his periodic table. Why do you think Medeleev did not predict the existence of the noble gases?
5.) Look at a modern periodic table. Suppose two new elements were discovered with the atomic numbers 120 and 121. Where in the periodic table do you think we would place these new elements?
6.) Suppose a new element X is discovered. It forms a compound with chlorine, and the formula of this compound is XCI4. What group or family do you think this element would belong to?
7.) Find the element barium (Ba) on a modern periodic table. What group or family is barium in? What do you think the formula of a compound of barium and chlorine would be?