Dividing by 2, then 2, then....how to do this easily? 1. The problem statement, all variables and given/known data The radius of a copper atom is roughly 1.3 x 10-10m. How many times can you divide evenly a piece of 10cm copper wire until it is reduced to two separate copper atoms? 2. Relevant equations No clue 3. The attempt at a solution 1.3 x 10-10 is the radius of one atom and it wants the width of 2 full atoms so (1.3 x 10-10)(4) = 5.2 x 10-10. But that is in meters so x100 makes it cm or 5.2 x 10-8. Now if you take 10cm and divide it by 2, 29 times, you get 5.2 x 10-8 , which is the same answer as in the back of the book. So you take 10/2 = 5/2 = 2.5........ but how do you do this easily? The book makes no mention of anything even close to dealing with it. I'm thinking its some logarithm thing or I have no idea.