Question

How was bohr's model modified in the modern quantum atomic model?

Answer 1

Electrons stopped flying around...

Explanation:

The Bohr model was an adaptation of the model according to Ernest Rutherford.

In the Rutherford model, most, if not all of the mass of the atom is/was concentrated in a VERY small nucleus (Protons & Neutrons), with the electron(s) circling around this nucleus in orbitals.

Bohr objected to the original Rutherford model due to energy-loss concerns, and introduced the concept of the Energy Quantum .
It clung on to the circling of electrons in their orbitals, though...

With the involvement of others (Heisenberg, Dirac, Pauli, de Broglie, and especially Erwin Schrodinger) the concept of circling in orbitals was eventually abandoned. Heisenbergs Uncertainty Principle states that we basically can't have any idea about the state or whereabouts of Electrons.

Schrodinger's formula calculates `Phi`, which in itself means nothing.

`Phi^2` however gives the chance that an electron might be found at a certain position relative to the nucleus. The parameters for this position are incorporated in the formula of course