History of the Atom Flashcards
The scientific name for materials is…
Matter
The spreading of particles is called….
Diffusion
The idea of the atom originated with…
Philosophers in ancient Greece
Dalton’s atomic theory
(1) All matter is made up of very small particles called atoms
(2) All atoms are indivisible. They cannot be broken down
(1) All matter is made up of very small particles called atoms
(2) All atoms are indivisible. They cannot be broken down
Dalton’s atomic theory
Who studied the discharge of electricity through gases
William Crookes
The electrode connected to the negative end of the battery is called the…
Cathode
What are cathode rays? How do they travel? What deflects them? What can they do with their energy?
Cathode rays are streams of negatively charged particles called electrons. They travel in straight lines from the cathode to the anode, are deflected by electric and magnetic fields, and have sufficient energy to move small objects such as a paddle wheel.
Who proposed the name electron to describe the particles in electricity
George Stoney
What did JJ Thomson show? what did he measure?
That electrons are negatively charged and measure the e/m of the electron.
Who did the Oil Drop experiment
Robert Millikan
What was the measured using the oil drop experiment?
The charge on the electron
Who proposed the Plum pudding model? How does it look?
JJ Thomson. A sphere of positive charge with negative electrons embedded in it at random
What are Cathode Rays?
