The periodic table organizes elements based on repeating patterns of their chemical and physical properties. 1) Mendeleev organized the elements based on properties and predicted new elements before discovery. 2) Elements are arranged in periods and groups, with similar properties repeating vertically in groups. 3) Periodic trends like atomic size, ionization energy, and electronegativity can be explained by the attraction of electrons to the atomic nucleus and how electrons fill energy levels.

1. Chapter 6 The Periodic Table The how and why

9. Other Systems 1A 2A 3A 4A 5A 6A 7A 8A 3B 4B 5B 6B 7B 8B 8B 8B 1B 2B 1 2 13 14 15 16 17 18 3 4 5 6 7 8 9 10 11 12 IA IIA IIIB IVB VB VIB VIIB VIIIB IIIA IVA VA VIA VIIA VIIIA IB IIB

10. Metals

20. Transition Metals -d block d 1 d 2 d 3 s 1 d 5 d 5 d 6 d 7 d 8 s 1 d 10 d 10

21. The P-block p 1 p 2 p 3 p 4 p 5 p 6

26. Writing Electron configurations the easy way Yes there is a shorthand

30. The Shorthand Sn- 50 electrons The noble gas before it is Kr [ Kr ] Takes care of 36 Next 5s 2 5s 2 Then 4d 10 4d 10 Finally 5p 2 5p 2

32. Part 3 Periodic trends Identifying the patterns

44. Symbol First Second Third HHeLiBeBCNO F Ne 1312 2731 520 900 800 1086 1402 1314 1681 2080 5247 7297 1757 2430 2352 2857 3391 3375 3963 11810 14840 3569 4619 4577 5301 6045 6276

50. Electronegativity

54. Ionization energy, electronegativity INCREASE

55. Atomic size increases, Ionic size increases

56. Nuclear Charge Energy Levels & Shielding