(A lone pair in MO theory is an electron pair in a non-bonding MO. What this really means is that the base has a HOMO that is pretty high-energy (a lone pair), and the acid has a LUMO that is pretty low energy. ![]() ![]() In a Lewis acid/base reaction, an electron pair from the base is shared with the acid. Earlier, we said that most reactions can be called either Lewis acid/base or redox. LUMO is Lowest Unoccupied MO, the lowest-energy MO that doesn't have any electrons in it.įrontier MOs are very important for reactivity. HOMO is Highest Occupied MO, the highest-energy MO that has electrons in it. The frontier MOs are called the HOMO and the LUMO. In this case, we are interested in the MOs at the border between occupied and empty. Distinguish and describe the significance of frontier MOsįrontier means a border area, between two things (often, between 2 countries).But that is now in limbo: the government has admitted that bill will not be put before Parliament during the current session, and there is no word on if or when that might now happen.\) The Department for Transport has been working on plans to fully legalise e-scooters, with legislation set to be included in a new Transport Bill. While it is legal to buy an e-scooter and use it on private land with permission of the land owner, it is against the law to use a private machine on public roads. The bans highlight further the issues caused by the continuing confusion over the legality of private e-scooters.
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