Answer the following question given this paragraph: 

Schrödinger’s work on orbitals is the basis of the modern model of the atom, which scientists call the quantum mechanical model. The modern model is also commonly called the electron cloud model. That’s because each orbital around the nucleus of the atom resembles a fuzzy cloud around the nucleus, like the ones shown in the Figure below for a helium atom. The densest area of the cloud is where the electrons have the greatest chances of being.


Q: The modern model of the atom, which scientists call the quantum mechanical model, is based on what scientist's work on orbitals?


A:
schrödinger