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science vocab
ch.5 vocab
Term | Definition |
---|---|
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 |