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science vocab

ch.5 vocab

TermDefinition
periodic law when elements are arranged by atomic #, elements have similar properties appear at regular intervals.
period each row of the periodic table
metal element that is shiny and that conducts heat and electricity
nonmetal element that conducts heat and electricity poorly
semiconductor ( metalloid ) element or compound that conducts electricity better than insulators but not as well.
ionization atom acquires a + or - charge by gaining or losing electrons to form ions.
cation migrate to negatively charged cathode
anion atoms or group of atoms that have gained electrons
radioactive nucleus of unstable atom loses energy
alkali metal soft, shiny, and reacts violently with water.
alkaline earth metal harder, denser, stronger, and have higher melting points than alkali metals
transition metal much less reactive
noble gases exist as single atom
halogens most reactive nonmetals
group each column of periodic table
Created by: craig1823