Atomic Structure Flashcards
Who invented the plum pudding model
JJ Thomson
Who discovered the neutron
James Chadwick
Who proposed the idea that matter is composed of small individual particles called atoms
Democritus and leucippus proposed this theory
What did the ancient chemist Aristotle propose
He proposed that matter was made up of four individual elements
When and What did John dalton state in his atomic theory
He said that ‘ each element has its own unique brand of indivisible atom’ in the early 1800s
What experiment was Thomson carrying out when he discovered the electron
He was testing out if gases could conduct electricity
In thomsons experiment how did he show the electrons had a negative charge
He used the plum pudding model which helped his theory on how they are embedded together like a Christmas pudding
What did Ernest Rutherford do to JJ Thomsons model of the atom
He revised the model to the model which had electrons floating around a positive nucleus in 1911
What did James Chadwick discover which helped lead to the model of the atom
He discovered the neutron which helped support the idea of the central nucleus which contained neutral charge ( neutrons)
