Chemistry Chapter 5 Ionization Energy
Period Trends
As atomic number increases across a row/period/series, ionization energy will increase
Group Trends
As atomic number increases within a family/group/column, ionization energy will decrease
Ionization Energy (IE)
Energy required to remove an electron (from valence shell) from an atom
First ionization energy
Energy required to remove the most loosely held electrons (from valence shell) from an atom
Reason for period trends
Going from metals to nonmetals - closer to octet (stable), which will take more energy to remove electron(s)
Up
Ionization energy increases when going _____ of the periodic table (horizontally)
Right
Ionization energy increases when going to the _____ of the periodic table (vertically)
Reason for group trends
Larger atomic radius Shielding effect