Question

2. (A) Cite two important quantum-mechanical concepts associated with the Bohr model of the atom. (B) Cite two important additional refinements that resulted from the wave-mechanical atomic model.

Answer 1

(A)

1) The electrons are free particles that are revolving or moving in discrete orbitals around the protons and neutrons

2) Electron energy is quantized into shells

(B)

1) In the wave-mechanical atomic number, the electron position is calculated in terms of probability of finding the electron in the terms of probability distribution where probability of finding the electron at center of nucleus is zero

2) Electron is characterized by four quantum number (n,l,ml,ms) with energy quantized between shells and subshells