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please help 1. If the atomic radius of sodium atoms is 1.861010m, how many sodium atoms are needed to make a line that is 1.00cm

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1. If the atomic radius of sodium atoms is 1.861010m, how many sodium atoms are needed to make a line that is 1.00cm in length? 2. If the atomic radius of osmium atoms is 1.341010m, how many osmium atoms are needed to make a line that is 5.85m in length? What is the mass of an electron in atomic mass units

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