The noble gases that do not react with other elements can be found in group

At the top of the noble gases is little helium (He), with a shell that is full with only two electrons. The fact that their outer shells are full means they are quite happy and don't need to react with other elements. In fact, they rarely combine with other elements. That non-reactivity is why they are called inert.

Explanation:

Thank you for asking that question, I had the same on my homework XD

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answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )