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Unit 3 Vocabulary
Term | Definition |
---|---|
proton | positively charged particle in the nucleus of an atom |
neutron | neutral particle in the nucleus of an atom |
electron | particle with negative charge |
electron cloud | area around nucleus where electrons can be foudn |
nucleus | positively charged, central part of the atom |
atomic number | number of protons |
isotope | same element with different number of neutrons |
average atomic mass | average mass of an element's isotopes |
periodic table | chart of elements arranged into rows and periods based on physical and chemical properties |
ionic bond | gain or loss of electrons |
covalent bond | sharing of electrons |
ion | atom that is no longer neutral, it is either positive or negative |
compound | substance made of 2 or more elements |
exothermic reaction | chemical reaction that releases thermal energy |
endothermic reaction | chemical reaction that absorbs thermal energy |
rate of reaction | speed at which a chemical reaction occurs |
catalyst | substance that speeds up a chemical reaction |