I was reading about hybridisation and came across a point saying that $\mathrm{d^3s}$ hybridisation involves only $\mathrm d_{x-y}$, $\mathrm d_{y-z}$, and $\mathrm d_{z-x}$ orbitals and not $\mathrm d_{x^2-y^2}$ nor $\mathrm d_{z^2}$. Why is that so?

Would you still call neutral and positively-charged molecular metal oxides polyoxometalates, or do you know a better/proper way to name this class of compounds (Polyoxometalloids/Polyoxometallic species/Polyoxometallides/...)? This question occurred on the premise of an interesting paragraph in ...

There are heteropoly-acids and isopoly-acids, two classes of polynuclear compounds with and without heteroatoms within its molecular structures, respectively. These are the names widely used in the literature for a long time[1]. Why two non-homogeneous prefixes ("iso-" vs "hetero-") are used? Wou...

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here,should I prefer hydride shift or a product with more $\alpha$ hydrogens? my doubt is...as hydride shift is easier than methyl shift,the answer should be $a$ or $c$.if methyl shift takes place the alkene formed has more $\alpha$ hydrogens than $a$ and $c$.what should I prefer? The question i...

When I run a linear-response time-dependent DFT calculation in my favourite electronic structure program, for each excitation I'm given an oscillator strength, $f_i$, and transition dipole moment $$\boldsymbol{\mu}_i = \int\Psi_0\hat{\mu}\Psi_i \text{d} \bf{r}$$ What formulae relates the transiti...