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Why do protons and neutrons<br>stay together in the nucleus?

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Why are electrons so far<br>away from the nucleus?

How many times bigger is a proton than an electron?

It depends on what you mean by bigger. A proton is about 1835 times more massive than an electron. If you are asking about their physical dimensions - no one knows. Scientists currently do not know how small electrons are. They are smaller than we can currently measure and may not have a size at all!

Author:

Steve Gagnon, Science Education Specialist (Other answers by Steve Gagnon)