bond between atoms

The idea of electrons 'in orbit like planets' around the nucleus is simplistic. In bonding, it is more useful to speak of 'charge distribution density', e.g.
http://journals.aps.org/prb/abstract/10.1103/PhysRevB.13.5597

Fresco is correct.

Electrons are very strange and they follow some very complex and counter-intuitive mathematical rules called quantum mechanics. To see them as little particles "revolving" around the nucleus is a very simple model that isn't even very good at describing what happens in actual experiments.

To understand this better, you will need to take a Quantum Mechanics course in college. Unfortunately it involves a level of math that it takes a couple of years to master (namely calculus and linear algebra). You can get there... but it takes a little while to study the subject.

I hate to say this, but any explanation you see in a high school chemistry textbook is going to be over simplistic. You need to take what they say with a grain of salt, and understand that they are trying to take a very advanced mathematical subject for a general audience.