1. { Trends in the Periodic Table

2.  COLUMNS in the periodic table  Also called “Families”  Similar characteristics Groups

3.  ROWS in the Periodic Table  Periodic recurrence of similar properties; Trending  Solids to liquids to gases  Losing electrons to gaining electrons  Etc. Periods

4. Interactive Periodic Table

5. Periodic Table Trend: Atomic Size Why?

6. Periodic Table Trend: Atomic Size

7. Because…  Down a group  Each row adds another energy level (orbit / shell) –  so the outermost electron is farther from the nucleus  And the atom gets bigger  Across a period  The number of protons increases,  so the increasing positive charge holds the electrons more tightly  And since the energy level of the outermost electron is the same, the atom gets smaller