| A | B |
|---|
| atom | The smallest unit of a pure substance that still has the properties of that substance |
| nucleus | The control center of the cell which directs all the cell's activities |
| proton | A subatomic particle that has a positive electric charge |
| neutron | A subatomic particle that has the same mass as a proton but no electric charge |
| electron | A negatively charged sub-atomic particle |
| atomic number | The number of protons in an atom |
| element | A pure substance that is made up of only one kind of atom |
| metal | An element that conducts heat and electricity |
| malleability | The property of a metal that indicates that it can be bent and rolled into sheets |
| nonmetal | An element that does not conduct electricity and is not shiny or malleable |
| periodic table | A table of elements arranged according to their atomic number |
| solid | A state of matter tha thas definite shape and volume |
| liquid | A state of matter that has a definite volume but no definite shape |
| gas | A state of matter that has no definite shape or volume |
| compound | A substance formed of the atoms of two or more elements |
| acid | A compound that reacts easily with other substances and turns blue litmus paper red |
| base | A compound that reacts easily with other substances and turns red litmus paper blue |
