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.

Remove ads
Don't know
Know
remaining cards
Save
0:01
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:
Retries:
restart all cards




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

Chemistry

Radioactivity

QuestionAnswer
What is Radioactivity? Radioactivity is the spontaneous breaking up of a certain unstable nuclei accompanied by the emission of radiation.
Who discovered Radioactivity? Henri Becquerel, a French Scientist.
How did he discover radioactivity? He did this by exposing crystals of uranium of sunlight on a photographic plate. An image resulted on the photographic plate. He thought the energy from the sun was released.
What are alpha particles? Alpha particles are helium nuclei He(2)(4) with a positive charge with a little penetrating ability,can be stopped by a piece of paper.
What are Beta particles? They are electrons with a negative charge (-) and are greater penetrating ability. Can be stopped by 5mm Alliminium.
Created by: Elif07