The heavier noble gases are more reactive than the lighter ones because they have lower ionisation energies in comparison to the lighter ones.
The noble gases are the group of elements in the periodic table's rightmost column—helium, neon, argon, krypton, and xenon—that have "filled" outermost electron shells (two for helium, eight for the others). This electron configuration produces a neutral atom with relatively low electron affinity and relatively high ionisation energy. As a result, in most natural situations, these elements do not form chemical compounds, hence the term "noble."
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