Understanding the Periodic Table of Elements

1. Topic: Chemistry Aim: Explain how elements are classified in the Periodic Table of Elements. Do Now: http://www.bbc.co.uk/schools/ks3bitesize/science/chemical_material_behaviour/compounds_mixtures/activity.shtml HW: Other side of homework ditto.

2. http://www.bbc.co.uk/schools/ks3bitesize/science/chemical_material_behaviour/compounds_mixtures/revise9.shtmlhttp://www.bbc.co.uk/schools/ks3bitesize/science/chemical_material_behaviour/compounds_mixtures/revise9.shtml

4. Periodic Table of Elements • System of grouping all of the known elements and to predict the properties of elements

5. Element Key

6. Atomic number: # of protons • Never changes • Same as # of electrons (in a neutral atom) • Different for each element

8. Element Key

9. Mass number: protons + neutrons • Round up the atomic mass

11. How can we determine the # of neutrons? • Mass # - Atomic # 197-79 = 118 neurons

12. How many protons? How many electrons? How many neutrons? 2 2 2 4-2 =

15. How are elements arranged? • In order of increasing atomic number

16. Columns • Families or Groups • Elements have similar BUT NOT identical properties

17. Ex: Family 1 (Alkali metals): • are all soft, white, shiny metals • highly reactive

18. Ex: Family 2 (Alkaline Earth Metals) • are less reactive than alkali metals • highly reactive • are shiny

19. Ex: Family 13 (Boron Family): • are all soft and metallic

20. Rows • Periods (7 of them) • Elements are not alike in properties • Left to right  atomic # increases

21. 4 main categories of PT

22. 1. Metals: 88 elements to left of zigzag line (metals or metal-like elements)

27. Topic: Chemistry Aim: Explain how elements are classified in the Periodic Table of Elements. Do Now: HW: Color the nonmetals, metalloids and noble gases on your periodic table different colors. (Chemistry Castle Learning due on Monday!) • Determine the: • # of protons • # of electrons • # of neutrons

30. 2. Nonmetals: to right of zigzag line

32. Sulfur

33. 3. Metalloids:have properties of both metals and nonmetals

35. 4. Noble Gases (inert gases) • Group 18 (He, Ne, Ar, Kr, Xe, Rn)

36. Noble gases glow brightly when an electric charge is passed through them, and so are used as advertising signs: neon tubes glow red, xenon blue, and krypton bluish-white; argon tubes glow pale red at low pressures, blue at high pressures.

37. Let’s summarize… • Explain how the periodic table of elements is arranged. • What are the various pieces of information that can be found in an element key? • Describe the location of metals, nonmetals, metalloids and noble gases on the periodic table.

38. Review: • Elements in the periodic table are arranged by • atomic number • atomic weight • number of neutrons • chemical reactivity

39. 2. Which of these things will you NOT find in the periodic table? • Element symbol • Atomic weight • Atomic orbital radius • Atomic number

40. 3. Elements at the left of the periodic table are known as • Nonmetals • Metals • Noble Gases • Metalloids

41. 4. Elements at the right of the periodic table are known as • Nonmetals • Metals • Noble Gases • Metalloids

42. 5. Which element is a metalloid? • S (Sulfur) • Si (Silicon) • Ba (Barium) • Br (Bromine)

44. 5. Volume is • the amount of matter in an object • the amount of space an object takes up. • the gravitational pull on an object. • an object's resistance to a change in motion.

45. 3. A millimeter is equal to a. 0.1m b. 0.01m c. 0.001m d. 0.0001m

46. 6. A liter of water contains • 1000 mL. b. 100 mL. c. 10 mL. d. 1 mL