Atomic Structure - Nuclear Chemistry

From email:

I was reading a book of "on Food and Cooking" and i came up with the question that, why proton in an atom does not repeal each other or why electrons of same atom does not attract it's own proton? i have read it's answer also but i am still unclear. could you please explain this

Atoms are pretty amazing things for the exact reasons you point out. Protons are positively charged, so if like charges repel each other, the protons in an atom should be trying to get as far apart as possible. But all of the positively charged protons in an atom are crammed into the tiny space of the nucleus.This was pretty confusing to the scientists who originally discovered the structure of the atom, but their data was conclusive, so additional research was required to explain their observations.
There are four basic forces in the universe: gravitational forces, electromagnetic forces, the weak nuclear force, and the strong nuclear force. The strong nuclear force is extremely strong, but it only acts over a very small distance, probably about the size of a proton or neutron. When 2 protons are brought very close together, the strong nuclear force is able to act and stick the protons together to form a nucleus.
The electrostatic/electromagnetic forces that cause protons to repel each other ("like charges repel") can act over a much longer distance than the strong nuclear force. This is why atoms don't just melt into each other under normal conditions; when two nuclei approach one another, the repulsive force between these positive charges pushes the nuclei apart. If the two nuclei are smashed together hard enough, the protons can get close enough to allow the strong nuclear force to take over and the nuclei fuse together. This is what happens in the sun. The extremely high temperatures make nuclei move very fast and the high pressure leads to a lot of collisions, so nuclei smash together and undergo nuclear fusion. The reverse of this process, nuclear fission, is what provides the energy in nuclear power plants.
What about the electrons? Electrons have very little mass and are moving very fast. The negatively charged electrons are attracted to the positive charged protons in the nucleus, but are moving fast enough to prevent them from crashing into the nucleus. Because electrons are so small and moving so fast, their motion is a little more complicated (due to quantum effects, but that's a little beyond this course...), but in a very basic way it can almost be thought of as the way planets move around the sun. The planets are attracted to the sun by gravity, but the motion of the planets keeps them from crashing into the sun.
In almost all chemistry and physics, properties and behavior are determined by the balancing of force. The fascinating part of science is figuring out how those different forces interact with each other.