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Chemistry
| 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 or physical means |
| periodic table | an organized table of all the known elements |
| atomic number | the number of protons of all the known or electrons in an element |
| .atomic symbol | abbreviation for the element 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 substances that are 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____ atoms that are ____bonded_________together |
| chemical bond | the force that holds two or more atoms together |
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