Create an account
Particles with an electrical charge of 1- (negatively charged) and are in the cloud outside the nucleus of the atom.
In the 1800's discovered a pattern by arranging the atoms according to the atomic mass.
The elements are arranged by increasing atomic number and by changes in physical and chemical properties.
Electron dot diagram
Uses the symbol of the element and dots to represent the electrons in the outer energy level.
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together