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rhenium

http://resource.geosciml.org/classifier/cgi/commodity-code/rhenium

definition Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust. more like this
notation
02.01.21 more like this
Re more like this
source http://en.wikipedia.org/wiki/Rhenium more like this
type
Resource original
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broader
http://resource.geosciml.org/classifier/cgi/commodity-code/metal original
narrower rhenium original
in scheme commodity-code original
is primary topic of rhenium