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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 |
PERIODIC 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 element name |
ATOMIC MASS | the mass of protons + neutrons (also called atomic weight or mass number) |
COMPOUND | A substance in which 2 or more elements are chemical joined in a set ratio |
MIXTURE | 2 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 orbit or path that electrons travel in around the nucleus |
MOLECULE | 2 or more atoms that are bonded together |
CHEMICAL BOND | the force that holds 2 or more atoms together |