Play Structure
what role does the strong force play in the structure of an atom?
The strong force binds the protons and neutrons together. This force has a short range, only about the width of a proton or neutron.
The electromagnetic force is much much weaker, but it has infinite range. When an atom has a lot of protons and neutrons, the electomagnetic force of every proton pushes against every other protons in the atom (neutrons aren't effected by the electomagnetic force, they're neutral), but the strong force pull a proton towards only a couple of protons or neutrons, those really close by.
Radioactive materials have so many protons that the electromagnetic force overcomes the much much stronger "strong force", and with a little jiggling, a proton sometimes is ejected.
Iron has the perfect balance of protons and neutrons to balance out the strong force and the electromagnetic force.
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