10. Periodic Properties of the Elements

Which of the following statements is false? 

For main-group elements, the atomic radius increases going down a group because: 

Which of the following statements is false? 

a) The electron affinity of phosphorus is less exothermic than those of both silicon and sulfur. 

b) The second ionization energy of oxygen is less than the first ionization of fluorine.

c) As the principal quantum number of an atom increases the effective nuclear charge will increase. 

d) Cations are smaller than their parent atoms. 

e) The second electron affinity of an atom will be more exothermic than the first electron affinity. 

Which of the following statements is true? 

Why do you think an increase in atomic radius would result in a lower ionization energy?

Ionization energies decrease moving down a group because the valence electrons are farther from the

Down a group in the periodic table, the change in ionization energy is due to