Thirteen Ed Online - What's Matter?

		Goals for Group 2 What's Matter? Go to Interactive Physics Modules (http://ippex.pppl.gov/interactive/) and answer the questions for Goal 3. Goal 3 1. When an atom has a ___________ (extra protons or electrons) it is called a(n) ___________. 2. What is an atom with a particular number of protons called? 3. How many elements are there? 4. What simple element has only one proton? 5. What chart is used to organize the elements? 6. When elements combine, what do they form? 7. What is the "shell model"? 8. How many electrons can each of the three levels (or shells) hold, in respective order from lowest to highest level? 9. Does the number of electrons in an atom equal the number of protons when the net charge of an element is zero? 10. What makes elements more stable in their environment? 11. What is the form that hydrogen takes naturally? 12. What is the formula for the molecule that covers 75% of our earth? Do-It-Yourself Research Go to Chem4Kids: Elements (http://www.chem4kids.com/atoms/structure.html) and choose one element to research. After you have read some material from the interactive periodic table on this site, fill in the following: Name of element ___________ Symbol ____________ Number of electrons ____________ Cool fact: Where can this element be found around you?