16.1 Outline on the d-block elements 16.1.1 The atom radii and ionization energy of the d-block elements 16.1.2 General physical properties 16.1.3 The chemical properties of the d-block elements 16.1.4 Oxidation numbers of the d- block elements 16.1.5 Colors of the d-block metal ions in solution§16.1 Outline on the d-block elements 16.1.5 Colors of the d-block metal ions in solution 16.1.4 Oxidation numbers of the d￾block elements 16.1.3 The chemical properties of the d-block elements 16.1.2 General physical properties 16.1.1 The atom radii and ionization energy of the d-block elements