Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account


smallest particle of matter that contains the characteristics of an element


central region of an atom


same mass as neutron, located in nucleus


same mass as protons, located in the nucleus


smallest of three particles in an atom, located on energy levels


outermost energy level


combined atoms


contains 2 or more elements chemically combined in specific proportions

atomic number

number of protons in the nucleus

mass number

total mass, protons+neutrons


atoms with the same number of protons but different number of neutrons


has an electrical charge because of a gain or loss of one or more electrons

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!


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

Voice Recording