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

Sign up for an account

Already have a Quizlet account? .

Create an account


negatively charged particles in an atom


positively charged particles in an atom


neutrally charged particle in an atom

electron cloud

region surrounding the nucleus that contains the electrons

atomic number

the number of protons in the nucleus of each atom of that element


atoms of the same element that have different numbers of neutrons

mass number

the sum of the numbers of protons and neutrons in the nucleus of an atom

atomic mass

weighted average mass of all the isotopes of an element,


the positively charged dense center of an atom


an atom that has a negative or positive charge because it has gained or lost 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