What are the two important developments that significantly contributed to the formulation of a more suitable and general model for atoms?

Question

What are the two important developments that significantly contributed to the formulation of a more suitable and general model for atoms?, The invention of the electron microscope and the discovery of the nucleus., The discovery of protons and neutrons., The dual behavior of matter and the Heisenberg uncertainty principle., The Bohr model and the Rutherford model.

MARKS App · Accepted Answer

Two important developments that contributed significantly to the formulation of a more suitable and general model for atoms were the dual behavior of matter and the Heisenberg uncertainty principle.

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