So say if we're doing an electronic configuration for the element "Lead", We would do [Xe] 6s^2 and 4F^14, but we still need to add in the "d" block. Would it be 5d^9 or 5d^10?

Answer 1

https://en.wikipedia.org/wiki/Electron_configuration#/media/File:Electron_orbitals.svg << the order of filling

[Xe] 4f14 5d10 6s2 6p2 the order of writing (others write in the order of filling)