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chemistry vocab
| Term | Definition |
|---|---|
| matter | Anything that has mass and occupies space. |
| element | a substance composed of a single kind of atom that cannot be broken down into other substances by chemical physical means |
| period table | an organized table of all the known elements |
| atomic number | the number of protons or electrons in an element |
| atomic symbol | an abbreviation for the elements name |
| atomic mass | the mass of protons + Neutrons (also called atomic weight or mass number) |
| compound | a substance in which two or more elements are chemically joined in a set ratio |
| mixture | two or more substance mixed together but not chemically combined |
| atom | the smallest unit of an element that retains (or keeps) the properties of that element |
| nucleus | the central core of an atom that contains the protons and neutrons |
| proton | small,positively charged particle in the nucleus of an atom |
| neutron | small, uncharged particle in the nucleus of an atom |
| electron | a tiny, negatively charged high energy particle that moves in the space around the nucleus of an atom |
| electron shells | fixed orbits or paths that electrons travel in around the nucleus |
| molecule | two or more atom that are bonded together |
| chemical bond | the force that holds two or more atoms together |
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