2.Atom: the smallest particle of an element that has the same chamical properties as the element.
3.Nucleus:an atom´s dense center, wheremost of its mass is.
4.Electron: a negatively charged particle that moves around an atom´s nucleus.
5.Proton:a positively charged particle inside an atom´s nucleus.
6.Neutron:a particle with no charge inside an atom´s nucleus.
7. Atomic number:the numbers of protons in an atom.
8.Metal:any of a group of elements that conduct heat and electricity, is shiny and bendable.