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Contains all of the mass of the atom, is positively charged because of protons. (responsible for MASS of atom)

Electron Cloud

The part of an atom that takes up space, is negatively charged because of electrons. (responsible for VOLUME of atom)

Electron (charge)


Proton (charge)


Neutron (charge)


Electron (mass)


Proton (mass)


Neutron (mass)


Electron (location)

Electron cloud

Proton (location)


Neutron (location)


Atomic Number

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)

Electrostatic force

Proton (binding force)

Nuclear forces

Neutron (binding force)

Nuclear forces

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