1. Do Now : K1+ (cation) ionization energy atomic size
What ion will be formed when a K atom loses 1 e-?
K1+ (cation)
Match the following important vocab words w/the correct definition:
ionization energy
atomic size
Volume or radius of an atom
Energy required to remove an e- from an atom in the gas phase
K + energy K1+ + e-
IONIZATION ENERGY

2. Electronegativity A super duper important idea for chemists…
It is the measure of the ability of an atom’s nucleus to attract electrons from a different atom within a covalent bond.
(Higher electronegativity means a stronger pull on e-)

3. Summary of Periodic Trends
Atomic radius decreases
Ionization energy increases
Electronegativity increases
Ionization energy decreases
Electronegativity decreases
Atomic radius increases 1A 2A 3A 4A 5A 6A 7A
Ionic size (cations) Ionic size (anions)‏
decreases decreases

4. Periodic Table Groups