Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
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. Your email address is only used to allow you to reset your password. See 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
edit
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

Ch. 11- science HH

Ch. 11 study guide for test

QuestionAnswer
What is an atom Smallest particle into which an element can be divided and still keep it properties.
Democritus 440 B.C.E., Greek philosopher,thought that you couldn't cut a matter forever.
John Dalton 1803,based ideas on experiments.stated: all substances are made of atoms, all atoms of one atom are exactly alike, and atoms can join other atoms to make new substances. Atoms can't be created,destroyed, or divided.
J.J Thomson 1897, british scientist discovered negatively charged particles that are known as electrons. Cathode-ray experiment. (plum pudding)
Ernest Rutherford 1911, the center of an atom is a tiny, positively charged part called a nucleus. (gold foil experiment)
Neil's Bohr 1913, Danish scientist discovered that electrons move around in energy levels, paths.
Erwin shrödinger and Werner Heisenberg Austrian and German scientists, discovered that electrons are found in regions inside the atom called electron clouds. ( modern theory)
Atoms .00000003 cm big. Made up of protons, neutrons, and electrons.
Protons,neutrons,electrons Protons-positively charged particles in the nucleus Neutrons- nonelectrical charged particles Electrons-negatively charged particles in atoms.
Isotopes Atoms that have the same number of protons but have a different number of neutrons. Unstable atom, radioactive isotope.idetify isotopes by mass number.
Created by: helen_ih
Popular Physical Science sets

 

 



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