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its "how many atoms r der in an element "
the no. of atoms in an element depends on the no. written as a subscript on an element, like O2 has 2 atoms of oxygen where as NaCl has 1 atom of Na and 1 atom of 1 Cl.


There is only one type of atom per element. 

Pure gold is made of only gold atoms. 

Pure iron is made of only iron atoms. 

And so on... 
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