What are Electrons and Excitation? 

Not really cuz photon is wave like so I still have no idea how it works

That's because, when an electron tends to go to a lower energy level/orbit, it needs to release energy in the form of light, gas or whatever.It releases because, the lower energy orbit can not afford an electron with a higher energy.

It's simple, it's the electrons that make mercury release a uv photon and then remember that it's the uv photon that makes phosphorus release low frequency light

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Or will the excited electron fill the uncoppied states. For example in oxygen, it has 2 unoccupied states since it has 6 valence electron. So if this is the case, what about in the noble gases where it is stable or no states are unoccupied.

If you mean when the electron returns to its shell, this is because when it leaves it’s original shell placement it knows that it is not it the right order and it cannot handle the increased level of energy it has gained by moving to a higher energy level as it originally started with a lower energy level

This causes it to release the overwhelming energy it has gotten in the form of light as seen in the video, so it can return to it’s original energy level placement

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I guess it is to keep it stable, since argon is unreactive gas.

Yh argon together with helium and neon are unreactive gasses (noble gas)

yes