Starting in 1908, while a professor at the University of Chicago, Millikan worked on an oil-drop experiment in which he measured the charge on a single electron. J. J. Thomson had already discovered the charge-to-mass ratio of the electron.
You would first do research. (d)
The research part will help you find what ideas worked and what ideas didn't work.
Answer: salt
Explanation:
Arrhenius acids are substances which dissociate in water to give 
ions.
Arrhenius bases are substances which dissociate in water to give 
ions.
Thus when they combine, they neutralize each other and produce salt and water.
Answer: Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released... hence, mono-electronic hydrogen has many spectral lines.
Explanation: sry its late
