Xenon has 8 valence electrons. Valence electrons are the electrons in the outermost shell of an atom, which are involved in chemical bonding. Xenon, being a noble gas, has a full outer shell, making it generally unreactive under normal conditions.
In the periodic table, xenon is located in Group 18, also known as the noble gases. Elements in this group have a complete set of valence electrons, which is why they are typically inert. For xenon, the electron configuration is [Kr] 4d10 5s2 5p6, indicating that it has 8 electrons in its outermost shell (5s and 5p orbitals).