Contains all of the mass of the atom, is positively charged because of protons. (responsible for MASS of atom)
The part of an atom that takes up space, is negatively charged because of electrons. (responsible for VOLUME of atom)
The number of protons in an atom. This determines what element the atom is.
Mass Number (calculation)
= protons + neutrons
Mass Number (definition)
The mass of a specific atom. This is NOT found on the periodic table.
Electron (binding force)
Proton (binding force)
Neutron (binding force)
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above 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.
Your microphone is muted
For help fixing this issue, see this FAQ.