Atomic theory

Today in class we learned about the atomic theory, law of conservation, and new discoveries of the atom. First, Dalton's theory stated: that elements are made up of tiny particles called atoms, all atoms of a given element are identical, the atoms of a given element are different from those of any other element, atoms of one element can combine with atoms of other elements to form compounds, atoms are indivisible in chemical processes and are not simply created or destroyed. We also learned that points number 2 and number 5 are invalid because of new information that has come about. Next, we learned about the law of constant composition. What this means is that every compound of the same species are always put together in the same order. For example, water is always 2 hydrogen's and an oxygen. Lastly, we learned about new discoveries of the atom. JJ Thomson was the person who discovered electrons by using a cathode ray to show the atoms of any element emit particles with a negative charge. This is shown through the plum pudding or chocolate chip model. Ruthford used the gold foil experiment to prove the presence of a positively charged center in an atom. Finally, the current model is the cloud model where electron location is pinpointed using probability.

http://www.humanthermodynamics.com/Atom_diagram.jpg


Atomic theory song here!
The history of the atom/Crash Course here!
Here is a website that may help with Atomic Theory here!
Atomic theory timeline here!