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.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
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 5/9

Democritus thought matter was composed of atoms
Rutherford Positively charged alpha particles are ions of helium
Transmutation conversion of one element to another by natural or artificial means
Tracers chem compound where 1+ atoms are replaced by a radioisotope
radioisotope atom with unstable nucleus
chain reaction products cause reaction to continue or magnify
Protium H-1
Deuterium H-2
tritium H-3
Dalton Revised concept of atom
ionizing radiation dislocate bonding electrons and create ions when passing through matter
transuranic elements follow uranium. atomic #'s greater than 92
fission heavy nuclide splits into 2
critical mass minimum quantity of an element needed to support a self-sustaining chain reaction
mass defect difference between mass of protons and neutrons and the mass of nucleus
Thomson showed exisistance of electron
fusion uniting 2 light elements to form heavier one
artificial nuclear rection disintegrate in definite fashion with specific half life
Created by: Ljg1237



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:
restart all cards