Chapter 7

Based on knowledge of the electronic configuration of titanium, state which of the following compounds of titanium is unlikely to exist: ${\mathrm{K}}_3{\mathrm{TiF}}_6,{\mathrm{K}}_2{\mathrm{Ti}}_2{\mathrm{O}}_5,{\mathrm{TiCl}}_3,$ ${\mathrm{K}}_2{\mathrm{TiO}}_4,{\mathrm{K}}_2{\mathrm{TiF}}_6$

The ionization energy of a certain element is $412\mathrm{kJ}/\mathrm{mol}$. When the atoms of this element are in the first excited state, however, the ionization energy is only $126\mathrm{kJ}/\mathrm{mol}$. Based on this information, calculate the wavelength of light emitted in a transition from the first excited state to the ground state.