viernes, 24 de septiembre de 2010

vocabulary 6

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


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


atom: the smallest unit of an element that still has the properties of the elements.


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


neutron: an uncharged particle in the nucleus of an atom.
electron: a particle with a negative charge moving around the nucleus of an atom.


nucleus: the dense center part of an atom.


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











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