| A | B |
|---|
| atom | the smallest particles of an element that has all the chemical properties of that element |
| compound | a substance made up of two or more elements that are chemically combined |
| physical properties | characteristics of matter that can be measured or detected by the senses |
| chemical formula | a group of symbols and numbers that shows the elements that make up a compound |
| element | a substance that cannot be broken down into any other substance by ordinary chemical means |
| substance | matter that always has the same makeup and properties, wherever it may be found |
| chemical properties | characteristics of matter that describes how it changes when it reacts with other matter |
| mixture | a combination of two or more substances that can be separated by physical means |
| electron | atomic particle with a negative charge; found in the electron cloud; much smaller than a proton |
| chemical symbol | one or more letters used to stand for the name of an element |
| molecule | a particle made up of a group of atoms that are chemically bonded |
| proton | atomic particle with a positive charge; found in the nucleus; much larger than an electron and about the same size as a neutron |
