Don't sys exit 1, it will kill the python process, raise and exception:

https://github.com/TechPenguineer/chemispy/blob/d3c35cec0cf3d595ad0ac35e0c340b1db6bd88df/chemispy/utils/atomic_number_query.py#L129

atomic_query_range = range(1,len(atomic_number_query.elements)+1)
if atomic_number not in atomic_query_range:

is the same as if not 1 < atomic_number < atomic_number_query.elements +1:

And the whole function can just be:

return atomic_number_query.elements[atomic_number-1]

It will just raise an error if it's not there.

class atomic_number_query:
    elements=[
              "Hydrogen",
              "Helium",
...

This is not java, you don't need classes everywhere. Just

elements=[
              "Hydrogen",
              "Helium",
             ...

Is fine.

Same for https://github.com/TechPenguineer/chemispy/blob/d3c35cec0cf3d595ad0ac35e0c340b1db6bd88df/chemispy/elements/hydrogen.py and all element.

You likely want an Element base class and have each element be an instance.

You Like even want a dataclass

Don't publish the chemispy.egg-info, and look into flake8 and black for code style. For testing look into pytest.

You also likely want to see /r/learnpython on reddit

Good luck

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Description Hey, wassup? Its a lot of classes on the project and it in the future can make your project hard to manage. You can use the same class element_class can return all the data, you will only need a mini database - it can be a JSON file with all the element informations or even a python dictionary.

Then you can match the argument of atomic_number_query (for example) with the key of your mini database and return a generated class on runtime, instead of have one class for each element.

You can check an elements JSON on this example. So you will have all the elements information in one point, instead of multiple class