6
Given all $\ce{B}$ are equivalent in terms of AXE notation, for $\ce{AB4}$ the following coordination environments are possible [1, p. 177]:
square-planar $(D_\mathrm{4h},$ SP-4);
square-pyramidal $(C_\mathrm{4v},$ SPY-4);
tetrahedral $(T_\mathrm d,$ T-4);
see-saw $(C_\mathrm{2v},$ SS-4).
Table IR-9.3 Polyhedral symbols, geometrical structures and/or ...
3
It is safe to say that Barycenter is the correct spelling for the sought word. The other versions are artifact of the original word as some authors preferred to name (especially in the internet).
Barycenter (or Barycentre in British English) is a commonly used term in astronomy and in chemistry (in Crystal Field Theory) as well. In both fields, it is used to ...
3
It is important to clearly separate the terms denticity, hapticity and bridging.
An atom or a ligand is bridging is one single atom bonds to two different acceptors.
A ligand (but never a single atom) can be multidentate or multihaptic if two atoms of that ligand can bond to the same acceptor.
A ligand such as the amide anion cannot be multidentate or ...
1
If the orbitals of the metal core is distorted. the amount of splitting is not high enough to promote the pairing of energy. therefore the 2 electrons will go to two separate eg orbitals. let the splitting energy due to this distortion be β1. the electron in the lowers orbital will have an energy loss of β1/2 and the electron in the higher orbital will have ...
1
The pairing energy is considered only when under the stong field of the ligand the electrons are forcefully paired and not when the electrons in the d orbital are filled according to hunds rule.
Hence for a $\mathrm d^7$ system under weak field, CFSE value is $0.8\Delta$ only. Answer for the above question is (C)
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