84* top 9 elements

The Top 9 Elements in our Solar System are:
   (percentages by weight)
Hydrogen      91.04%
Helium           8.81%
Oxygen          0.08%
Carbon          0.03%
Neon              0.01% 
Nitrogen        0.01%
Magnesium   0.004%
Silicon           0.003%
Iron               0.003%  


Element of the day (day 84)
#43) Tc- Technetium-] radioactive   
not found naturally or occurs in such minute amounts that it does not reasonably exist on Earth.
Discovered in 1937 by Carlo Perrier & Emilio Segre, Italy.
A silvery-gray radioactive metal. Has a fairly short half-life, so any natural technetium on Earth has long since disappeared. Can be artificially produced. Found in cool, red stars. Has few commercial uses- is a superconductor at very low temperatures and is used in medical radiation imaging as a tracer.

Was the first artificially produced element. Does not exist in the Earth's crust.