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The Periodic Table (PT) is organized so that you can "see" trends for specific physical/chemical properties as you:
a) Go Down a Column (also called Group or Family)
b) Across a row/period (from L to R on PT)
The properties are:
Coulombic Force (CF):
Definition: Attractive force between the positive nucleus and valence electrons (ve-). CF is a function:
a) Energy level of ve- (i.e. distance ve- is to nucleus). Higher energy level, less CF
b) # of ve-, more ve-, greater CF
Atomic Radii/size
Definition:
1) Down a Column (Group/family)
Trend:
Reason:
2) Across a row/period
Trend:
Reason: