What the electron configuration using subshell of Pt

1 answer

The electron configuration of Platinum (Pt) using subshells is:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d9

Note that the 5d subshell is not completely filled, as there are only 9 electrons in it, rather than the maximum of 10. This is due to the phenomenon of electron configuration stability, and is commonly observed in transition metals.