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

Chem- Chapter 4

Democritus' ideas nature's basic particle was the atom; atoms physically resembled the matter it made
Aristotle's ideas matter could be infinitely divided; matter was made of some combination of elements (earth, water, fire, air)
Dalton's Modern Atomic Theory the elements are composed of atoms & only whole numbers of atoms can combine and form compounds
Modifications to the Modern Atomic Theory atoms are divisible; an element can have atoms with different masses
Subatomic Particles the proton, neutron, & electron
Anatomy of an atom nucleus + electron cloud; mostly empty space, mass of atom is in the nucleus
J.J Thomson discovered the electron with his cathode ray tube experiment in 1897
Cathode Ray Experiment Cathode rays were shot through an atom, which registered negatively charged particles.(Cathodes are deflected by a magnetic field and the rays are deflected from negatively charged objects)
Robert Millikan Measured the exact value of the negative charge with his oil drop experiment in 1909
Thomson's atomic model "plum pudding" model, electrons stuck in a mound of positive charge
Ernest Rutherford discovered the nucleus with his gold foil experiment in 1911
Gold foil experiment Alpha particles were shot through a sheet of gold foil
Expected gold foil experiment outcome Alpha particles pass through, slightly deflected by the positive charge spread throughout the atom
Actual gold foil experiment outcome Most particles went straight through, some were deflected, very few bounced back at large angles
Rutherford's atomic model "nuclear atom" model, tiny positively charged nucleus with electrons floating outside of it
James Chadwick discovered neutrons in 1932
Atom the smallest particle of an element that retains the chemical properties of that element
Created by: cdye13