Why was a change in the Bohr Model of atom required? Due to which important development$(s)$,was the concept of movement of an electron in an orbit replaced by the concept of probability of finding an electron in an orbital? What is the name given to the changed model of atom?

(N/A) The Bohr model failed because it treated the electron as a particle moving in well-defined circular orbits,which requires knowing both the exact position and velocity of the electron simultaneously.
This violates the $Heisenberg$ uncertainty principle,which states that it is impossible to determine both the position and momentum of a subatomic particle simultaneously.
Additionally,the Bohr model did not account for the wave-particle duality of matter.
The concept of an orbit was replaced by the concept of an orbital (a region of probability) due to two major developments:
$1$. The de-Broglie concept of the dual nature of matter.
$2$. The $Heisenberg$ uncertainty principle.
The new model is known as the $Quantum$ $Mechanical$ model of the atom.