10. Periodic Properties of the Elements

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

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.