The radius of a iron atom is 124 pm. How many iron atoms would have to be laid side by side to span a distance of 1.75 mm?
So 1.75mm/(2x124pm)=1.75x10^-3m/(2x124x10^-12 m)
So 7.06x10^6 iron atoms would have to be laid side by side to span a distance of 1.75 mm
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