elements

• element = atom class

features

1. feature: # of protons
   List

   1. Hydrogen
   2. Helium
   3. Lithium
   4. Beryllium
   5. Boron
   6. Carbon
   7. Nitrogen
   8. Oxygen
   9. Fluorine
   10. Neon
   11. Sodium
   12. Magnesium
   13. Aluminum
   14. Silicon
   15. Phosphorus
   16. Sulfur
   17. Chlorine
   18. Argon
   19. Potassium
   20. Calcium
   21. Scandium
   22. Titanium
   23. Vanadium
   24. Chromium
   25. Manganese
   26. Iron
   27. Cobalt
   28. Nickel
   29. Copper
   30. Zinc
   31. Gallium
   32. Germanium
   33. Arsenic
   34. Selenium
   35. Bromine
   36. Krypton
   37. Rubidium
   38. Strontium
   39. Yttrium
   40. Zirconium
   41. Niobium
   42. Molybdenum
   43. Technetium
   44. Ruthenium
   45. Rhodium
   46. Palladium
   47. Silver
   48. Cadmium
   49. Indium
   50. Tin
   51. Antimony
   52. Tellurium
   53. Iodine
   54. Xenon
   55. Cesium
   56. Barium
   57. Lanthanum
   58. Cerium
   59. Praseodymium
   60. Neodymium
   61. Promethium
   62. Samarium
   63. Europium
   64. Gadolinium
   65. Terbium
   66. Dysprosium
   67. Holmium
   68. Erbium
   69. Thulium
   70. Ytterbium
   71. Lutetium
   72. Hafnium
   73. Tantalum
   74. Tungsten
   75. Rhenium
   76. Osmium
   77. Iridium
   78. Platinum
   79. Gold
   80. Mercury
   81. Thallium
   82. Lead
   83. Bismuth
   84. Polonium
   85. Astatine
   86. Radon
   87. Francium
   88. Radium
   89. Actinium
   90. Thorium
   91. Protactinium
   92. Uranium
   93. Neptunium
   94. Plutonium
2. feature: mass
3. feature: energy level
4. feature: group
5. feature: block
6. feature: Metallic/Nonmetallic Character