Purpose:
Pre-Lab Questions:
Extension Questions:
Post Lab Questions:
- So that we will learn how the elements are grouped in the periodic table and what kind of information you can obtain by reading the periodic table.
Pre-Lab Questions:
- What is an element? How many different kinds of atom is any element made of?
- An element can be a lot of things such as a gas, a liquid, and even sometimes a solid. An element can be made up of many atoms and have a different atomic mass then other elements, but it can also be made up of protons, neutrons, and electrons.
- What is the atomic mass of an element?
- The atomic mass is the amount of protons and neutrons in an atom that make up the elements atomic mass.
- What is the atomic number of an element?
- The atomic number of an element is the amount of protons that are in the nucleus of the atom.
Extension Questions:
- After you prepared your periodic tables, your teacher gave you additional sets of cards to fit into tables. How did your table change each time you added new elements to your table?
- After we prepared the tables we we're given a set and what I did was just get the atomic numbers and fit them into my periodic table.
- How was your table similar to a modern periodic table? How is your different?
- The periodic table I made is similar to the actual periodic table because it is organized in from least to greatest when it comes to the atomic mass but it is also very different because it is organized into sections such as metals, non metals, etc.
- How do we explain today the fact that tellurium comes before iodine in the periodic table, even though tellurium has a higher atomic mass then iodine?
- Iodine is after tellurium because iodine has more protons then tellurium and that's why iodine is after tellurium.
- Mendeleev predicted the existence of gallium and germanium because of the holes in his periodic table. Why do you think Mendeleev did not predict the existence of the noble gases?
- He was able to predict gallium and germanium because there was a very obvious and big gap in his periodic table. He also wasn't able to predict the noble gases because no noble gases were discovered during the time he proposed the periodic table and he didn't think that there would be another group of elements.
- Look at a modern periodic table. Suppose two new elements were discovered with the atomic numbers 120 and 121. Where on the periodic table do you think we would place these new elements?
- They would fit in the element with 120 atomic mass would simply be after tin and then the element with 121 atomic mass would be decided on which element has more protons to see which elect would be first.
- Suppose a new element "X" is discovered. It forms a compound with chlorine, and the formula of this compound is XC14. What group or family do you think this element would belong to?
- I think that "X" would be a halogen just like chlorine.
- 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?
- Barium would most likely be in metal category of the periodic table because I searched up barium and it described it as a very metallic element. But upon further research I found that when it mixes with chemicals or water it oxidizes so I think it would have a cool reaction if you mixed chlorine and barium together.
Post Lab Questions:
- How many groups or families of elements are in your table?
- There are a total of 8 families of elements in this table
- What criteria did you use to choose which group or family an element belongs to?
- The criteria that I chose to use in order to group the elements was the amount of atomic mass each element had starting from least to greatest.
- Is there a trend in atomic mass going across your table? Is there a trend in atomic mass going from top to bottom?
- Yes there is a trend going from top to bottom it is that it rises from least to greatest.
- Are there any exceptions to these trends? If so which elements are break the trend? Why did you arrange these elements the way you did?
- I arranged the elements this way because I figured it was the easiest way to group them and it was a way that I would be able to understand it. I didn't break the trend or make any exceptions during this process.
- Are there any holes or gaps in your arrangement? Where are they? What do you think these gaps might mean?
- There are many gaps in my arrangement, especially considering that there are many more elements that we have not discovered and we don't know where these elements go but the gaps mean that when we find out what they are we need to find its atomic mass to fit it in with the arrangement.