To derive is defined as to come from, be created from or be developed out of something else. An example of derive is when you get the idea for a new fund raising event based on the event the previous year.
Rubidium: geological information. Rubidium is far too reactive to be found as the free metal in nature. It is relatively rare, although it is the 16th most abundant element in the earth's crust. Rubidium is present in some minerals found in North America, South Africa, Russia, and Canada. It is found in some potassium minerals (lepidolites, biotites, feldspar, carnallite), sometimes with caesium as well.
Natural rubidium is a mix of two isotopes: 85 Rb, the only stable one, constitutes 72% of it. The remaining 28% is the slightly radioactive 87 Rb with a half-life of 49 billion yearsâmore than three times longer than the estimated age of the universe.ubidium has a number of oxides, including rubidium monoxide (Rb 2 O), Rb 6 O and Rb 9 O 2, which form if rubidium metal is exposed to air; rubidium in excess oxygen gives the superoxide RbO 2. Rubidium forms salts with halides, making rubidium fluoride, rubidium chloride, rubidium bromide, and rubidium iodide.