What two properties of an electron did robert millikan determine?

Two properties of an electron that Robert Millikan determine are as follows:

1. Charge carried by the electron

2. Mass of the electron.

Robert Millikan's oil drop experiment was performed to find out the charge on an electron. As charge to mass ratio that was determined by J.J. Thomson , was known so he was then able to determine the the mass of an electron.

Radium is silvery, lustrous, soft, intensely radioactive. It readily oxidizes on exposure to air, turning from almost pure white to black. Radium is luminescent, corrodes in water to form radium hydroxide. Although is the heaviest member of the alkaline-earth group it is the most volatile..