7 The Periodic Table Today Arranged by atomic numberOver 100 known elements todaySome elements have not been discovered yet – spaces on the Periodic Table have been left for them
8 Groups and Periods 18 vertical columns called GROUPS or FAMILIES Elements in each group have similar characteristicsGroup 1 are the alkali metals – react violently with waterGroup 18 are the Noble Gases – rarely react at all7 horizontal rows called PERIODSSeries of different elements that are not alikePattern: reactive to non-reactive
9 What causes bonding power? Valence electronsThe elements in each group of the periodic table have the same number and arrangement of valence electrons
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