Is Xe6s25d106p4 a possible ground state electron configuration?

Answer 1

No, Xe 6s2, 5d10, 6p4 , this is not ground state of any Xe descendant.

In fact it is an impossible electron configuration, because the 4f-block is missing, which should be filled in before 6p block at the 'end' of the 6throw,

so it even isn't 84Po [Xe] 6s2 4f14 5d10 6p4 .

Xenon ground state is in short note: [Kr] 5s2 4d105p6

In full: [1s2, 2s2 2p6, 3s2 3p6 3d10, 4s2 4p6] 5s2 4d10 5p6

Radon ground state is in short note: [Xe] 6s2 4f145d10 6p6

In full: [1s2, 2s2 2p6, 3s2 3p6 3d10 3f14, 4s2 4p6 4d10, 5s2 5p6] 6s2 4f14 5d10 6p6