Oil Drop Experiment

Chemistry Mix n Match

The oil drop experiment was performed by Robert A. Millikan and Harvey Fletcher in 1909 to measure the elementary electric charge (the charge of the electron). The experiment entailed observing tiny charged droplets of oil between two horizontal metal electrodes.


Graphic by Eric Hamber Secondary

Gold foil experiment

Chemistry Mix n Match

The Rutherford-Geiger Experiment is also known as the Gold Foil Experiment. They were a landmark series of experiments by which scientists discovered that every atom contains a nucleus where its positive charge and most of its mass are concentrated.


Graphic by Eric Hamber Secondary

Henri Becquerel

Chemistry Mix n Match

Henri Becquerel was a French physicist who accidentally discovered Radioactivity.


Graphic by Eric Hamber Secondary

Spontaneous Radioactivity

Chemistry Mix n Match

Discovered by Henri Becquerel, also known as Radioactive Decay.


Graphic by Eric Hamber Secondary

Electron

Chemistry Mix n Match

Identified by JJ Thomson, the electron is a subatomic particle, symbol e− or β−, with a negative elementary electric charge.


Graphic by Eric Hamber Secondary

Marie and Pierre Curie

Chemistry Mix n Match

Other scientists which joined the investigation of radioactivity after Becquerel. Marie discovered source of alpha particles was the radioactive element polonium.


Graphic by Eric Hamber Secondary