It's a silver-gray metal with a mushy consistency, but you won't ever see any. It's not terribly common, plus it's so reactive that it never exists in nature by itself, only in a compound.
Zodarion rubidum was created in 1914.
Not sure about rubidum, but rubidium is a metal.
37
The term half life describes the time taken for half of a total amount of radioactive isotopes to decay. However that doesn't mean that they all take exactly that length of time. Some will decay much more quickly than that and some more slowly. As such even though the half life is longer than the age of the earth, some of the Rubidum 87 isotopes will have decayed. Based on the proportion of rubidum 87 to the daughter isotopes you can still use this for dating materials younger than the half life of rubidum 87.
The chemical formula for rubidium acetate is RbC2H3O2.
This alkali metal is Rubidium Rb, having atomic no 37
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We would write either "How did it look?" or "What did it look like?"
they look like you
this is what he look's like
Why do you look like you do?