Elements and Atoms

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




Atom: The smallest particle of an element that has the same chemical properties as the element.





Nucleus: An atom's dense center, where most of its mass is.




Electron: a negatively charged particle that moves around an atom's nucleus.




Proton: a positively charged particle inside an atom's nucleus.




Neutron: a particle with no charge inside an atom's nucleus.



Atomic number: the number of protons in an atom.




Metal: any group of elements that conduct heat and electricity, is shiny and bendable.

Physical Properties

Matter: any solid,liquid,or gas.

Mass: amount of matter in an object.

Volume: the amount of space an object takes up.




Density: the amount of mass in a certain volume of material.




Physical property: a propertythat can be observed without changing the identity of a substance.



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




Solution: a mixture of one substance dissolved in another so that the properties are the same throughout.




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