Ytterbium (Yb)
Ytterbium was first prepared in 1937, although a much purer version was produced in 1953. It occurs in a number of minerals along with other rare earth elements.
Ytterbium is bright, silvery, lustrous, soft, malleable, and ductile. It's fairly stable but should be protected from air and moisture. Natural ytterbium includes seven stable isotopes; seven unstable isotopes are also known.
The metal has been used to improve the properties of stainless steel and one isotope may find use as a substitute radiation source for portable X-ray machines, but few other applications exist.
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