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Memory Alpha
Name: Kryptonite
Symbol: Kr
Atomic weight: 01

Krytonite is a chemical element listed on the Table of Elements. It is a member of the Hypersonic series. (TNG: "Rascals")

The element Kryptonite had the symbol "Kr" which is the same atomic symbol used for Krypton. It is named after the fictional element from stories of Superman published by DC Comics. For what it's worth, the DC version of Kryptonite is number 126 on the table (a position held by as-yet undiscovered element provisionally named Unbihexium, Ubh).
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