Vocab review

Term Definition
Nucleus The center of an atom.
Atom Basic unit of all matter.
Element A substance made of only one kind of atom.
Matter Anything that has a mass and a volume.
Proton Positively charged particle in an atom.
Substance Is matter with a composition that is always the same.
Heterogeneous A mixture that is not evenly mixed.
Homogeneous A mixture that is evenly mixed.
Electron the negatively charged particle in an atom.
Neutron The neutral particle in an atom
Ion An atom with a charge
Isotope An atom with a different number of neutrons.

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