r/AskChemistry

I'm currently preparing an oral presentation on photocatalytic concrete and I'm interested in the reaction. After a lot of research, I understand that TiO₂ is primarily used as a catalyst to create two radicals, but I can't find the complete reaction or what happens to the titanium after the formation of OH⁻ and O₂. Any help would be greatly appreciated, and please excuse me if my question isn't worded correctly; I'm not familiar with Reddit, chemistry, or English.

I’m in my 2nd year of my degree, and one of the things I struggle with is group theory. I’m managing to get to grips with it a bit more, and am trying to construct the methane MO diagram using group theory.

I’ve determined that the C 2S orbital is of course A1, and that the hydrogen orbitals are A1 + T2. The bit I’m stuck on is using the projection formula. There are 24 operations in total, and I’m taking one of the s orbitals and figuring out what each of the transformations would do to it. Fine. Thing is, there are 8 C3 transformations and each of them is going to have a different effect, and this seems like a really tedious way to do it, not to mention easy to mess up.

Is there a shortcut I’m missing when it comes to this sort of thing?

Do you know a periodic table probably not made for actual use but more for artistically style?
Like take Promethium, Thorium, Titanium, Nickel. The origin of the names are from Greek and Norse mythology and even folklore. You also have celestial ones like Uranium and Plutonium, all can be easily depicted. Of course not all elements are like this.
But do you know such a periodic table similar to what I described?