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

Matter and Energy

Unit 3 Lessons 1-2

atom the smallest particle into which an element can be divided and still be the same element.
electron negatively charged particles.
nucleus a small, dense center that has a positive charge and is surrounded by moving electrons.
proton positively charged particles in the nucleus.
neutron uncharged particles in the nucleus.
electron cloud an area around the nucleus.
atomic number the number of protons in the nucleus of an atom.
mass number the total number of protons and neutrons in an atom's nucleus.
periodic table an arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column, or group.
chemical symbol an abbreviation for the element's name.
average atomic mass the weighted average of the masses of all the naturally occurring isotopes of that element.
metal elements that are shiny and conduct heat and electricity well.
nonmetal poor conductors of heat and electricity.
metalloid elements that have some properties of metals and some properties of nonmetals.
group each vertical column of elements (from top to bottom) on the periodic table.
period each horizontal row of elements (from left to right) on the periodic table.
Created by: 18kielyc0311