If someone wanted to build a scale model of the atom with a nucleus 1.00 m in diameter, how far away would the nearest electron need to be?
Question by OpenStax is licensed under CC BY 4.0
Final Answer

50 km50 \textrm{ km}

Solution video

OpenStax College Physics for AP® Courses, Chapter 30, Problem 3 (Problems & Exercises)

OpenStax College Physics Answers, Chapter 30, Problem 3 video poster image.

In order to watch this solution you need to have a subscription.

Start free trial Log in
vote with a rating of votes with an average rating of .
1 view

Calculator Screenshots

  • OpenStax College Physics, Chapter 30, Problem 3 (PE) calculator screenshot 1
Video Transcript
This is College Physics Answers with Shaun Dychko. Given a scale model with a nucleus having a diamter of 1 meter, we can figure out the radius of this hypothetical nucleus which would be half of that which is 0.5 meters. Now we know what the ratio is of the atom to a nucleus and an atom is typically about 10 to the minus 10 meters wide and the nucelus is 10 to the minus 15 meters wide. And so we are gonna have the same ratio in our scale model so the radius of our scale atom divided by the radius of our scale nucleus has to have the same ratio as for real atoms. And so we'll multiply both sides by the radius of our scale nucleus and we solve for the radius of our scale atom. So that's r little n times r capital A over r capital N; that's 0.500 meters times 10 to the minus 10 meters over 10 to the minus 15 meters which is 50 kilometers. So having a nucleus of 1 meter to scale would need an atom of radius 50 kilometers.