a) How many hydrogen atoms, which measure 0.1nm across, will fit across a single caesium atom with a diameter of 0.6nm ?

Question

b) The diameter of a copper atom is approx 0.3nm. How many copper atoms could be lined up across a pin head measuring 1.5mm (1,500,000nm)?

 

(to convert m to nm multply by 1000,000,000. To convert nm to m divide by 1000,000,000). The diameter of an atom ramges from about 0.025 to 0.5nm I think the answer to a) is 6 hydrogen atoms and b) 5,000,000 copper atoms. But that seems too simple?

Answer 1

The problem is simple, and your method and answers are correct.