10. Periodic Properties of the Elements

Which of the following represents the third ionization of Mn?

Of the following atoms, which has the largest third ionization energy? 

The K_w for water at 0°C is 0.12×10⁻¹⁴. Calculate the pH of a neutral aqueous solution at 0°C.

The successive ionization energies for an unknown element are:

IE₁ = 896 kJ/mol IE₂ = 1752 kJ/mol IE₃ = 14,807 kJ/mol IE₄ = 17,948 kJ/mol

To which family in the periodic table does the unknown element most likely belong?