§ Element: a susbtance that cannot be broken down any further into anything simpler.
§ Atom: the smallest particle of an element that has same chemical properties as the elements.
§ Nucleus: an atom’s dense center where most of its mass it.
§ Electron: a negatively charged particle that moves around an atom’s nucleus.
§ Proton: a positively charged particle inside an atom’s nucleus.
§ Neutron: a particle with no charge inside an atom’s nucleus.
§ Atomic number: the number of protons in am atom.
§ Metal: any of a group of elements that conduct heat and electricity, is shiny and bendable.
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