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.

domingo, 13 de marzo de 2011


1. Matter: any solid, liquid, or gas.

2.Mass: The amount of matter in an object.

3.Volume: The amount of space an object takes up.

4.Density: The amount of mass in a certain volume of material.

5.Phisical Property: A property that can be observed without changing the identity of the substance.

6. Physical Change: A change in size,shape,or state without forming a new substance.

7.Solution: A mixture of one substance dissolved into another so that the properties are the same throughout.

8.Chemical Change: a change in matter a change in matter that produces a new substance with different properties from the original.