1.) Matter - anything that has mass and takes up space
2.) Atom - the basic unit of matter that cannot be broken down
3.) Proton - positively charged particles in an atom ( + )
4.) Neutron - uncharged particles in an atom ( 0 )
5.) Electron - negatively charged particles in an atom ( - )
6.) Nucleus - the center of an atom that holds the protons and neutrons
7.) Element - matter made up of one kind of atom
8.) Molecule - a substance that is made up of two or more atoms
9.) Compound - a substance that is made up of atoms of two or more different elements that are chemically combined
10.) Mixture - a combination of 2 or more things that are not chemically combined
11.) Periodic Table - a way to organize all of the elements by their properties and atomic number.
12.) Atomic number - the number of protons in an element
13.) Atomic Mass- the number of protons and neutrons in an element
14.) Chemical Symbol - the abbreviation that represents an element
15.) Pure substance - a substance that always has the same properties (such as appearance, melting point, & reactivity).
16.) Metal - elements that are shiny and are good conductors of heat and electricity.
17.) Nonmetal - elements that are dull in appearance and are poor conductors of heat and electricity.
18.) Metalloid - elements that have characteristics of metals and nonmetals
19.) Group (family)- the columns on the periodic table
20.) Period - rows on the periodic table that have similar properties
21.) Homogenous - Consisting of a mixture of the ‘same’ type of substance22.) Heterogenous - Consisting of a mixture of the ‘different’ types of substances