4. red and green are opposites

5. assume red and green cancel each other net color = neutral

6. take away one red

7. net color = 1 green

8. take away two red

9. net color = 2 green

11. net color = neutral

13. net color = 2 red

14. in this arrangement …

15. green is trapped inside. Only red balls can be added or taken away…

18. color = 2 green

21. color = 1 red

23. color = ?

24. 3 red

25. color = ?

26. 3 green

28. In order to understand what ions are, we need to know that…

29. + + + + + the particles that make up atoms have either positive or negative charge

30. +++++ positive and negative are opposites they cancel each other out

31. +++++ net charge = zero

32. + the positive (+) particle is called a proton

33. the negative (-) particle is called an electron

34. +++++ in an atom, protons ( ) are in the center and electrons ( ) are on the outside +

35. +++++ only electrons ( ) can be added or taken away

36. +++++ this is an atom with 5 electrons and 5 protons

37. +++++ the atom is neutral net charge = zero

38. +++++ 5 (-) and 5 (+) = zero charge (neutral)

39. +++++

40. +++++

41. +++++ charge = ?

42. +++++ charge = 1- (one minus)

43. +++++

44. +++++

45. ++++ charge = ?

46. +++++ 2+ ( two plus )

47. WHEN REMOVING ELECTRONS

48. THE RESULTING CHARGE IS POSITIVE

49. WHEN REMOVING ELECTRONS THE RESULTING CHARGE IS POSITIVE neutral 1+

50. WHEN ADDING ELECTRONS

51. THE RESULTING CHARGE IS NEGATIVE WHEN ADDING ELECTRONS

52. THE RESULTING CHARGE IS NEGATIVE neutral 2 WHEN ADDING ELECTRONS

53. An atom with positive or negative charge is called an drum roll ION

54. Atoms without charge are called ATOMS Atoms with positive or negative charge are called IONS

55. Notice that ONLY the number of e - changes The number of protons in an Atom NEVER changes (Only electrons are added or subtracted) (why?)

57. ions make up the salt you put on your eggs in the morning

58. ions are required for your brain to function (ions allow you to see and understand this presentation)

59. ions are an essential ingredient in soap

60. ions are required for cellular respiration

61. ions make up acids and bases

62. ions keep your blood functioning

63. ions make up the salt you put on your eggs in ions are required for your brain to function (ions allow you to see and understand this presentation) ions are an essential ingredient in soap ions are required for cellular respiration ions make up acids and bases ions keep your blood functioning the morning