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The given dihydroborinine is indeed anti-aromatic if is it fully conjugated and planar, but counting pi electrons in a conjugated ring is not as simple as it seems when you have boron in the ring. If the boron is not joined to a ligand, as in (mono)boronine or unhydrogenated diborinine, it could pass its electron deficiency into the sigma bonding framework ...

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The energy is the potential energy of all electrons in the molecule. Sometimes the term also includes the potential energy of the nuclei but in most cases it doesn't. As reference or zero energy you can imagine the case where the electrons are non interacting or infinitely far apart from each other. In this sense it tells you the energy required to "...

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When electrons are removed from an atom, those in the outermost orbital is removed first. The p orbitals are most away from the nucleus, then the s orbitals, and finally the d orbitals. In fact, the closeness of d orbitals to the nucleus accounts for higher energy of the 4d orbitals than the 5s orbital. Because electrons are closer, there is a stronger ...

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The NIST Atomic Spectra Database,[1] which is as authoritative as it gets, shows that $\ce{5d^9 6s^1}$ is the correct ground-state electronic configuration for platinum. Various inorganic textbooks also say the same. Wikipedia cites Meissler and Tarr for this table: https://en.wikipedia.org/wiki/Electron_configuration#Other_exceptions_to_Madelung's_rule ...

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