PERIODIC TABLE VOCABULARY REVIEW FOR UNIT ON PERIODIC TABLE AND PROPERTIES Tools A B ALKALI METALS GROUP 1 ACTINIDES ELEMENTS 90 -103 OR 5f'S LANTHAIDES ELEMENTS 58 - 71 OR 4f'S ALKALINE GROUP 2 HALOGENS GROUP 17 NOBLE GASAS GROUP 18 METALS LOSE ELECTRONS FORM CATIONS NONMETALS GAIN ELECTRONS FORM ANIONS ANION NEGATIVE ION CATION POSITIVE ION TRANSITIONAL METALS d BLOCK INNER TRANSITIONAL f BLOCK OXIDATION NUMBER THE CHARGE THAT RESULTS WHEN AN ATOM GAINS OR LOSES ELECTRONS WHEN FORMING BONDS FIRST IONIZATION POTENTIAL ENERGY REQUIRED TO REMOVE THE MOST LOSELY HELD ELECTRON FROM AN ATOM ELECTRON AFFINITY THE ENERGY RELEASED WHEN AN ATOM IN THE GAS STATE GAINS AN ELECTRON VALENCE ELECTRONS ELECTRONS IN OUTER ENERGY LEVEL GROUP/FAMILY VERTICAL COLUMNS HAVE SIMILAR PROPERTIES PERIOD HORIZONTAL ROWS ELEMENTS IN SAME PERIOD HAVE SAME NUMBER OF ENERGY LEVELS ION CHARGED ATOM OR GROUPS OF ATOMS ELECTRON SHIELDING THE REPULSION OF OUTER ELECTRONS BY INNER ELECTRONS REDUCING THE ABILITY OF THE NUCLEOUS TO ATTRACT OUTER ENERGY LEVEL ELECTRONS