Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

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.
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

World Civilization


Nucleus contains protons and neutrons, + charge, heavy, small, and dense
cloud is... much larger than a nucleus
orbitals varies on the shape of an electron
prtotons +1 charge, heavy mass, located on nucleus
Neutron 0 charge, heavy mass, located in the nucleus
Electron -1 charge, light and located on the electron cloud
Atomic number # of protons, identifies which element an atom is
Mass number # of protons and neutrons
Isotopes same # of protons different number of neutrons
Periodic Table Developed by Dmitri Mendeleev in 1869 Originally ordered by mass today ordered by atomic number ordered left to right by increasing atomic #
Atomic mass Not the same as a mass number average mass of one atom of the element
protons same as atomic number
neutrons maass#-protons
electrons same as atomic number
metal Thermal/electricity (allows heat and electricity to travel through Malleable,ductile high density lustrous(shiny)
Semimetal A.K.A metalloids properties of both nonmetals and metals often are semi conductors
Organization periods horizontal rows (left and right) groups vertical (up and down)
group 1 Alkali metals
group 2 Alkalin earth metals
group 3-12 transition metals
group 16 chalcogens
group 17 halogens
group 18 nobel gases
valence electrons electrons in the outer most shell atoms can have up to 8 valence electrons based on group of the periodic table
octet rule atoms want to have 8 valence electrons atoms can gain, lose, or share valence electrons
Atomic radius The size of an atom as determined by the size of it electron cloud increase in size from top to bottom decrease in size from left to tight
Ionic Radius Cations-+ ions (smaller) Anions- -ions (larger)
Ionization energy atoms ability to attract electrons in a chemical bond decreases from top to bottom increases from left to right
Created by: cyn_dinh
Popular History sets




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