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carmen price asked the Naked Scientists: Hi,I have started level 1 chemistry/physics this year and i need your help in finding out what element on earth is the largest naturally occuring atom?What do you think?
Chemical composition See also: Abundance of elements on EarthThe mass of the Earth is approximately 5.98×1024 kg. It is composed mostly of iron (32.1%), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), calcium (1.5%), and aluminium (1.4%); with the remaining 1.2% consisting of trace amounts of other elements. Due to mass segregation, the core region is believed to be primarily composed of iron (88.8%), with smaller amounts of nickel (5.8%), sulfur (4.5%), and less than 1% trace elements.
lightarrow - I think she means the largest, not most abundant...I think.... which means that the heaviest naturally occurring element that is commonly found is Uranium,with an atomic mass of 92, although tiny traces of plutonium (94) can befound in nature as well.I think.... 
If instead she intended the largest in size, it's Caesium, with a radius of 260nm:
Quote from: lightarrow on 16/02/2009 16:05:28If instead she intended the largest in size, it's Caesium, with a radius of 260nm:I think that it should be 260 pm Mr. lightarrow or 0.260 nm