The model used to draw the three-dimensional sense of the shape of a molecule when there is no interest in the internal bonds is the space-filling model.
The space-filling model is an molecular model used in chemistry to diagram/present a molecule according to atoms represent by spheres.
This model (the space-filling model) is very useful to present the space filled by atoms present in a given molecule.
In conclusion, the model used to draw the three-dimensional sense of the shape of a molecule when there is no interest in the internal bonds is the space-filling model.
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