Unit 2 Study Guide

Name __________________________ Date ________ Unit 2 Study Guide: The Properties of Atoms The Structure of the Atom 1. What is an atom? 2. What is the nucleus? What is its charge? 3. What is a proton? What is its charge? Where is it located? 4. What is a neutron? What is its charge? Where is it located? 5. What is a electron? What is its charge? Where is it located? 6. Rank the masses of the three subatomic particles in order form smallest to largest. 7. What is the relationship between repulsion and attraction? 8. What does the Electron Cloud model of the atom say? 9. How does the size of the electron cloud compare to the size of the nucleus? Masses of Atoms 10. What is an element? 11. Why are elements different? 12. What is atomic number equal to? 13. How do you find mass number? 14. How many neutrons does Krypton-84 have? 15. How many neutrons does Zinc-65 have?

Name __________________________ Date ________ 16. What is the mass number of a Fluorine atom with 10 neutrons? 17. How would your write Boron-11 as a symbol? 18. What is an isotope? 19. What is average atomic mass? Is it found on the periodic table? 20. Is mass number located on the periodic table? The Periodic Table/Periodic Trends 21. Describe how the periodic table is arranged. 22. What are groups? 23. What are periods? 24. Why are groups useful? 25. Where are the Alkali metals located? 26. Where are the Alkaline Earth metals located? 27. Where are the Transition metals located? 28. What family is found at group 13? Group 14? Group 15? Group 16? Group 17? Group 18? 29. What is special about the Noble Gases? 30. What are valence electrons? How many does an atom need to be stable? 31. How many valence electrons do the elements in each of the following groups have?: 1, 2, 13, 14, 15, 16, 17, 18

Name __________________________ Date ________ Ions 32. How many atoms does He need to be stable? 33. When is an atom in the neutral state? 34. What changes during a chemical reaction? 35. An atom has 2 valence electrons. How will it become stable? What is the resulting charge? 36. An atom has 7 valence electrons. How will it become stable? What is the resulting charge? 37. How many valence electrons does each of the following elements have? a. Na+ b. Cl c. Cld. B e. O f. O238. How many total electrons does Ca2+ have? 39. What does a neutral O atom need to do in order to become stable? 40. What does a neutral Rb atom need to do in order to become stable? More Practice 41. Draw a Bohr model of Si.

42. Draw a Bohr model of Li+.

43. Draw a Bohr model of S2-.