Miami Hussain Posted December 5, 2015 Report Share Posted December 5, 2015 For topic 4/14 what are the elements that can break the octet rule. (HL ones included please) Also can Xe have 5 or 6 electron domains? If so, how are we supposed to know which one to use. E.g XeF4How are we supposed to know whether XeF4 has 5 or 6 electron domains? Please help Reply Link to post Share on other sites More sharing options...
Msj Chem Posted December 5, 2015 Report Share Posted December 5, 2015 Elements in period 3 onwards can exceed the octet rule.In the case of XeF4, it has 36 valence electrons. The Xe atom forms 4 bonds with the F atoms and each F atom has an octet (8) electrons. So that's 4 x 8 = 32 electrons. 36 - 32 = 4 electrons left over which make up two lone pairs on the Xe atom. So that makes 6 electron domains around the central atom (Xe), 4 bonding domains and 2 lone pairs of electrons.The shape is square planar and the bond angle is 90 degrees. See this video for a full explanation:https://youtu.be/JhJASNcL61o 1 Reply Link to post Share on other sites More sharing options...
Miami Hussain Posted December 5, 2015 Author Report Share Posted December 5, 2015 Thank you so much!Also, your videos are great, they're pretty much the reason I am passing! Reply Link to post Share on other sites More sharing options...
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