The element with the maximum number of isotope configurations is uranium (symbol: U). Uranium has the highest number of naturally occurring isotopes among all elements in the periodic table.
Uranium has three isotopes that occur naturally: uranium-238 (U-238), uranium-235 (U-235), and uranium-234 (U-234). Each of these isotopes has a different number of neutrons, resulting in distinct isotope configurations.
Uranium-238 is the most abundant isotope, accounting for over 99% of natural uranium. Uranium-235 is less abundant but is important for nuclear reactions, as it can sustain a nuclear chain reaction. Uranium-234 is a minor isotope, present in trace amounts.
Therefore, uranium has the maximum number of naturally occurring isotope configurations among elements.