 Custom Search Exceptions to the Octet Rule Elements that go below the octet rule: Boron and Beryllium-These 2 elements tend to violate the octet rule by having fewer than 8 electrons around them. Example Lewis Dot Videos- Lewis Dot of Beryllium Fluoride BeF2 Lewis Dot of Boron Trichloride BCl3 (also BF3)
Elements that exceed the octet rule: This behavior is observed for elements in Period 3 and beyond. This occurs because elements in period 3 have access to the 3d sublevel in addition to the 3s and 3p. Elements in period 2 only have access to 2s and 2p. So these elements can only hold 8 valence electrons, while elements in period 3 and beyond "have access to another sublevel" and may sometimes exceed the octet rule. Example Lewis Dot Videos- Lewis Dot of Sulfur Hexafluoride SF6 Lewis Dot of Phosphorous Pentachloride PCl5 Lewis Dot of Xenon Oxytetrafluoride XeOF4
Structures that could but Don't break the octet rule: Lewis Dot of Sulfur Dioxide SO2 |
