As you move from top to bottom within a group, the first ionization energy ________.

What is the reaction that corresponds to the first ionization energy of sodium, Na?

Which best explains why ionization energy tends to decrease from the top to the bottom of a group?

What is the general trend in ionization energy as you move down a column in the periodic table?

As you go from left to right across a period the first ionization energy generally?

What trend in ionization energy do you see as you move down a group?

Choose the element with the higher first ionization energy from each pair. a. Ge or Br b. P or In c. S or Te d. As or Br