Answer:

Bohr model was proposed by Niels Bohr in 1915. Quantum model is the modern model of an atom. The key difference between Bohr and quantum model is that Bohr model states that electrons behave as particles whereas quantum model explains that the electron has both particle and wave behavior

Erwin Schrödinger proposed the quantum mechanical model of the atom, which treats electrons as matter waves. ... Electrons have an intrinsic property called spin, and an electron can have one of two possible spin values: spin-up or spin-down. Any two electrons occupying the same orbital must have opposite spins.

Answer:

The concept of atoms and their structure was first introduced by John Dolton in 1808. He explained the laws of the chemical combination by considering atoms as invisible particles without a structure. Then in 1911, the New Zealand physicist Ernest Rutherford proposed that atoms consist of two components: a positively charged nucleus in the center of the atom and negatively charged electrons in the extranuclear part of the atom. Certain theories such as electromagnetic theory presented by Maxwell could not be explained with Rutherford’s model. Because of such limitations in Rutherford’s model, the Danish physicist Niels Bohr proposed a new model in 1913 based on the quantum theory of radiations. Bohr’s model was largely accepted and he was awarded the Nobel Prize for his work. Even though it was largely accepted, it still carries certain drawbacks and limitations. The main difference between Bohr model and Rutherford model is that in Rutherford model, electrons can revolve in any orbit around the nucleus, whereas in Bohr model, electrons can revolve in a definite shell