f-block

[rkusampudi]

Could someone explain the layout of the f-block on the periodic table?

[Eli Aminpour 2K]

The f block is a series of elements that would enter between group three and group four. The reason these elements are in the f block is because one or more of their outermost electrons is in the f orbital. If you were add the f block elements to the periodic table, it would expand in width.

[Brigita1D]

Side note: Professor Lavelle reminded us in class the other day that we only have to worry about the s,p, and first row of the d block. Most f-block elements are rare and unstable.

[Curtis Tam 1J]

The f block starts filling 2 blocks behind. It also goes in an irregular order since the energy differences between the higher principal quantum numbers get smaller and smaller. Therefore, there is a greater variation in electronic configuration with negligible deviations in energy from configurations formed from "normal" building up.