Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
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 Scientists

Important Scientists of the Atom

ScientistImportance
Democritus [Philosopher] (460 B.C.-370 B.C.) A greek philopsoper who was one of the first to believe in the existence of Atoms. He believed atoms were INDIVISBLE and INDESTRUCTIBLE. Did not explain chemical behavior.
John Dalton (1766-1844) English Chemist who created Dalton's atomic theory based on experimental methods.
Dalton's atomic theory Pt. 1 1. All elements are composed of tiny INDIVISBLE particles called atoms 2. Atoms of the same elemental are IDENTICAL. The atoms of any one element are different from those of other elements.
Dalton's atomic theory Pt. 2 3. Atoms of different elements can be combined phyiscally/ chemically to make simple whole-number ratios to form compounds. 4.Chemical reactions occur when atoms are seperated, joined, or rearanged. Atoms of one element are never changed into other atoms
J.J. Thomson (1856-1940) An English physicist who in 1897 discovered the ELECTRON via the Cathode Ray experiment. A cathode ray is an glowing green light that made of electrons {negatively charged}. Also concluded that Charge/mass ration was the same with varied gases
Robert A. Millikan (1868-1953) A U.S. Physicist who in 1916 reported the MASS of an ELECTRON very close to the one accepted today (1/1840 of a Hydrogen Atom).
Eugen Goldstein (1850-1930) A scientist who discovered PROTONS is 1886 when he noticed a ray running opposite to the Cathode Rays.
James Chadwick (1891-1974) An English physicist who in 1932 confirmed the existence of the NEUTRON.
Ernest Rutherford (1871-1937) A scientist who conducted the GOLD FOIL EXPERIMENT. This experiment debunked the previous "plum-pudding model" proposed by J.J.Thomson and created evidence for an Atom's NUCLEUS. Using this he created the Rutherford ATOMIC MODEL/Nuclear atom.
Created by: 22denney
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards