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Stack #2169673
| Question | Answer |
|---|---|
| matter | anything that has mass and occupies space |
| element | a substance composed of a single kind of atom that cannot be broken doown into others substances by chemical physicql means |
| periodict table | an orginized table of all the known elements |
| atomic number | the number of protons or electrons in a element |
| atomic symbol | an abbreviation for the element names |
| 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 |
| mixturen | two or more substances that are mixed together but not chemically combinded |
| 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, positivly charged partical in the nuclear of an atom |
| neutron | tiny,uncharged partical in the space of an atom |
| electron | a tiny, negitivly 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 nucleous |
| molecule | two or more atoms that are bonded together |
| chemical bonds | the force that holds two or more atoms together |