February 19th, 2017, 01:31 PM  #1 
Newbie Joined: Feb 2017 From: Maidstone Posts: 1 Thanks: 0  Atom Calculation too easy?
Atoms a) How many hydrogen atoms, which measure 0.1nm across, will fit across a single caesium atom with a diameter of 0.6nm ? 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? 
February 20th, 2017, 02:09 AM  #2 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,087 Thanks: 700 Math Focus: Physics, mathematical modelling, numerical and computational solutions 
Have you tried these yourself yet? If so, can you post your working out? Hint: you don't need to know any atomic physics to work these problems out... it's a bit like lining up boxes in a warehouse, just on a smaller scale. 
February 20th, 2017, 04:24 AM  #3 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,087 Thanks: 700 Math Focus: Physics, mathematical modelling, numerical and computational solutions  

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