Definition:Krypton/86
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Isotope of Krypton
Krypton-$86$ is the isotope of krypton which has $50$ neutrons in addition to its $36$ protons.
Kr-$86$ is the is the second most common stable isotope of krypton, making up $17.3 \%$ of the krypton found on Earth.
Historical Note
Krypton-$86$ was adopted in $1960$ as the basis of the definition of the metre.