martes, 26 de abril de 2011


1.Element: a substance that cannot be broken down any further into anything simpler.

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.