10. Periodic Properties of the Elements

Rank the following elements in order of increasing ionization energy:Br, F, Ga, K and Se.

Which of the following has the highest ionization energy? 

The energy of an electron in a one-electron atom or ion equals (–2.18 x 10^–18 J) (Z²/n²). Estimate the ionization energy for the valence electron of the Li atom and compare it to its theoretical value of 520 kJ/mol.

Write a chemical equation representing the second ionization energy for lithium. Use e⁻ as the symbol for an electron.

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?