Here's how to figure out the number of electrons in the 4d subshell of xenon in its ground state:

* Electronic Configuration of Xenon: Xenon (Xe) has an atomic number of 54, meaning it has 54 electrons. The electronic configuration of xenon in its ground state is:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶

* The 4d subshell: The 4d subshell is filled with 10 electrons.

Therefore, the 4d subshell in the ground state of atomic xenon contains 10 electrons.