The electromagnetic or E-M force causes like-charged things to repel and oppositely-charged things to attract.,. The force that keeps you from falling through the floor is the electromagnetic force which causes the atoms making up the matter in your feet and the floor to resist being displaced.

The carrier particle of the electromagnetic force is the Photon .  Photons of different energies span the electromagnetic spectrum of x rays, visible light, radio waves, and so forth. Photons have zero mass, as far as we know, and always travel at the "speed of light", c, which is about 300,000,000 meters per second, or 186,000 miles per second, in a vacuum.

Another problem with atoms? What binds the nucleus together?
The nucleus of an atom consists of a bunch of protons and neutrons crammed together. Since neutrons have no charge and the positively-charged protons repel one another,

Why doesn't the nucleus blow apart?
We cannot account for the nucleus staying together with just electromagnetic force.

What else could there be? Gravity?
No! The gravitational force is far too weak to overpower the electromagnetic force.

So how can we account for this dilemma?

Strong

The carrier particle of the electromagnetic force is the Photon .  Photons of different energies span the electromagnetic spectrum of x rays, visible light, radio waves, and so forth.

Photons have zero mass, as far as we know, and always travel at the "speed of light", c, which is about 300,000,000 meters per second, or 186,000 miles per second, in a vacuum. To understand what is happening inside the nucleus, we need to understand more about the quarks that make up the protons and neutrons in the nucleus.

Quarks have electromagnetic charge, and they also have an altogether different kind of charge called colour charge. The force between color-charged particles is very strong, so this force is "creatively" called.The strong force holds quarks together to form hadrons, so its carrier particles are whimsically called gluons because they so tightly "glue" quarks together. included the "hold-on," the "duct-tape-it-on," and the "tie-it-on!")

Colour charge behaves differently than electromagnetic charge. Gluons, themselves, have color charge, which is weird and not at all like photons which do not have electromagnetic charge. And while quarks have color charge, composite particles made out of quarks have no net colour charge (they are color neutral). For this reason, the strong force only takes place on the really small level of quark interactions, which is why you are not aware of the strong force in your everyday life.

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