Chemical & Physical Properties
Atomic Number: 36
Atomic Weight: 83.80
Discovery: Sir William Ramsey, M.W. Travers, 1898 (Great Britain)
Electron Configuration: [Ar] 4s2 3d10 4p6
Word Origin: Greek kryptos: hidden
Isotopes: There are 30 known isotopes of krypton ranging from Kr-69 to Kr-100. There are 6 stable isotopes: Kr-78 (0.35% abundance), Kr-80 (2.28% abundance), Kr-82 (11.58% abundance), Kr-83 (11.49% abundance), Kr-84 (57.00% abundance), and Kr-86 (17.30% abundance).
Element Classification: Inert Gas