1. PRACTICE THE ELEMENTS IN ORDER OF ATOMIC NUMBER Na Fe Pb Zn Sn K

2. H Hydrogen 1

3. He Helium 2

4. Li Lithium 3

5. Be Beryllium 4

6. B Boron 5

7. C Carbon 6

8. N Nitrogen 7

9. O Oxygen 8

10. F Fluorine 9

11. Ne Neon 10

12. Na Sodium 11

13. Mg Magnesium 12

14. Al Aluminum 13

15. Si Silicon 14

16. P Phosphorous 15

17. S Sulfur 16

18. Cl Chlorine 17

19. Ar Argon 18

20. K Potassium 19

21. Ca Calcium 20

22. Sc Scandium 21

23. Ti Titanium 22

24. V Vadadium 23

25. Cr Chromium 24

26. Mn Manganese 25

27. Fe Iron 26

28. Co Cobalt 27

29. Ni Nickel 28

30. Cu Copper 29

31. Zn Zinc 30

32. Ga Gallium 31

33. Ge Germanium 32

34. As Arsenic 33

35. Se Selenium 34

36. Br Bromine 35

37. Kr Krypton 36

38. Rb Rubidium 37

39. Sr Strontium 38

40. Zr Zirconium 40

41. Ag Silver 47

42. Cd Cadmium 48

43. In Indium 49

44. Sn Tin 50

45. Sb Antimony 51

46. Te Tellurium 52

47. I Iodine 53

48. Xe Xenon 54

49. Cs Cesium 55

50. Ba Barium 56

51. La Lanthanum 57

52. Ce Cerium 58

53. Eu Europium 63

54. W Tungsten 74

55. Pt Platinum 78

56. Au Gold 79

57. Hg Mercury 80

58. Tl Thallium 81

59. Pb Lead 82

60. Bi Bismuth 83

61. Po Polonium 84

62. At Astatine 85

63. Rn Radon 86

64. Fr Francium 87

65. Ra Radium 88

66. Ac Actinium 89

67. Th Thorium 90

68. U Uranium 92

69. Am Americium 95