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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 |