Why do noble gases usually react less readily than other elements?

Noble gases are less reactive than other elements because they possess a highly stable, closed-shell electron configuration. In these atoms, the outermost electron shell is completely filled, typically containing an eight-electron arrangement known as an octet.13

This stable structure results in very high ionization energy, meaning a significant amount of energy is required to remove an electron from the atom to participate in chemical bonding. Because their electrons are held so tightly by the nucleus and the shells are already complete, noble gases have little tendency to gain, lose, or share electrons with other atoms.23

While lighter noble gases like helium, neon, and argon are exceptionally inert, heavier members of the group, such as krypton and xenon, have lower ionization energies and can occasionally be induced to form compounds when exposed to highly aggressive reagents.42