The scientist that developed the equation of wave mechanics is <span>Erwin Schrodinger that combined the works of Bohr and de Broglie. The electron
was a three dimensional wave circling the nucleus in a whole number of wavelengths
allowing the waveform to repeat itself as a stable standing wave (it can absorb
energy form a nearby source which is oscillating at a proper frequency)
representing the energy levels of Bohr model. He also said that Broglie’s model
was correct about the matter waves and the electrons are located in the atomic
space according to standing wave frequencies.</span>
Answer:
A. There must be a change in chemical properties.
At least 2 or 3 atoms must change for it to be considered chemical. There must be some type of reactants that will change this. Otherwise, it's not a chemical reaction.
Hope this helps!