Palladium has 46 electrons, arranged 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10. Written on the previous noble gas that is [Kr] 4d10, and the shells hold 2, 8, 18, 18 electrons from the innermost outwards.
Every subshell is either full or empty, so the ground-state atom has no unpaired electron and is diamagnetic.
The periodic table, read every way a chemistry course asks for. This tool needs JavaScript; these are the pages it offers: