1. As always… Lon-Capa assignments Lecture videos Textbook Read
Do text homework

2. Four Trends to Understand
Atomic radius
Ionization Energy
Energy required to remove an electron from a gaseous atom or ion.
Electron Affinity
Energy change associated with the addition of an electron to a gaseous atom or ion.
Electronegativity
Ability of an atom in a molecule to attract shared electrons to itself.

4. IE vs. Atomic Number

5. Successive IEs

6. EA vs. Atomic Number

7. Clicker Question
Given that the ionization energy of Si(g) = 780 kJ/mol and that the electron affinity of Si(g) = –134 kJ/mol, determine the ionization energy of Si–(g).
a) 646 kJ/mol
b) –646 kJ/mol
c) 134 kJ/mol
d) –780 kJ/mol
e) The ionization energy of Si– cannot be determined with these data.

8. Clicker Question
Given that the first two ionization energy values for Rb(g) = 403 kJ/mol and 2633 kJ/mol, respectively, determine the electron affinity of Rb(g).
a) –403 kJ/mol
b) –2230 kJ/mol
c) –2633 kJ/mol
d) –3036 kJ/mol
e) The electron affinity of Rb(g) cannot be determined with these data.

9. Electronegativity