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What nuclear properties are unique to argon and cerium?

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They are the only chemical elements which have only stable isotopes with even mass numbers. Alternatively, they are two only chemical elements with even atomic numbers which have only stable isotopes with even neutron numbers. read more

Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. The chemical symbol for Cerium is Ce. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. read more

Indeed the great Japanese spectroscopist Akio Kotani once wrote that 'there is no genuine example of Cerium 4'. And as always there is mystery concealed just beneath the surface of even the most apparently simple looking chemistry. So why you might ask, is cerium a burn cream; that too is a mystery. read more

For the same reason argon is used to inflate diving suits. Old documents and other things that are susceptible to oxidation can be protected by being stored in an atmosphere of argon. Blue argon lasers are used in surgery to weld arteries, destroy tumors and correct eye defects. read more

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