<u>Answer:</u> The correct answer is Xenon (Xe).
<u>Explanation:</u>
Noble gases are defined as the gases which have fully filled electronic configuration or stable electronic configuration.
From the given options:
<u>Option 1:</u> Oxygen (O)
The atomic number of this element is 8.
Electronic configuration of this element: 
As, this is not the stable electronic configuration. Thus, it is not considered as a noble gas.
<u>Option 2:</u> Nitrogen (N)
The atomic number of this element is 7.
Electronic configuration of this element: 
As, this is not the stable electronic configuration. Thus, it is not considered as a noble gas.
<u>Option 3:</u> Chlorine (Cl)
The atomic number of this element is 17.
Electronic configuration of this element: 
As, this is not the stable electronic configuration. Thus, it is not considered as a noble gas.
<u>Option 4:</u> Xenon (Xe)
The atomic number of this element is 54.
Electronic configuration of this element: ![[Kr]5s^24d^{10}5p^6](https://tex.z-dn.net/?f=%5BKr%5D5s%5E24d%5E%7B10%7D5p%5E6)
As, this is a stable electronic configuration. Thus, it is considered as a noble gas.
Hence, the correct answer is Xenon (Xe).
