The abundance of neodymium in the earths crust is approx. 40 ppm.
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Beryllium concentration in the earth crust: 2,8 mg/kg
Beryllium concentration in the sea water: 5,6.10-6 mg/kg
Beryllium in the sun and solar system, as atom mole fraction
relative to silicon+1:
4.10-7
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The answer is unanswerable due to the fact that it is unknown.
The total collection of all the gold that has been found on Earth
would make a cube of 40 feet. If you know where to find more, feel
free to leave me information in my message area.
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The fractional abundance is calculated by dividing the abundance
of the isotope of interest by the abundance of all the isotopes of
the element. For chlorine-37, the percent abundance is 0.2434, or
24.34%.