Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Atomic History


Democritus if matter could be divided, it would not be able to put back together
Aristotle He thought that all matter was made up of a combination of his four elements. This was proven wrong
John Dalton (4 points) [English] "Billard Ball Model" 1.All matter is made up of atoms which are invisible and indestructible 2.All atoms of a given element are identical in mass and properties 3.Compounds are formed by a combination of two or more different kinds of atoms 4.REARRANGEMENT
Law of Conservation of Mass the mass before = the mass after
Law of Definite Proportions atoms combine in whole ratios
Law of Multiple Proportions atoms can combine in many different ways
J.J. Thomson [American] he discovered electrons "Plum Pudding Model"
Ernest Rutherford [Kiwi] the majority of an atom is empty space but in the centre there is a positively charged very dense nucleus -discovered the nucleus
Neils Bohr [Danish] each orbit holds few electrons electrons can jump between orbits - go up but want to come back down further the electron, the more energy it has the frequency of lights is given off depending on which shell it came from
Created by: jakiday