lunes, 20 de septiembre de 2010


1.Element: a basic building block of matter; a pure substance that cannot be broken down into anything simpler.

2.Compound: a chemical combination of two or more elements into a single substance.

3.Atom: the smallest unit of an element that still has the properties of the element.

4.Proton: a particle with a positive charge in the nucleus of an atom.

5.Neutron: an uncharged particle in the nucleus of an atom.

6.Electron: a particle with a negative charge moving around the nucleus of an atom.

7. Nucleus: the dense center part of an atom.

8. Molecule: a group of more than one atom joined together that acts like a single particle.

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