D-block (for diffuse) elements consist of the transition metals (group 3-12 on the periodic table) in which the outermost electron shell is the D orbital. D-block elements form at least one stable ion with an incompletely filled electron subshell.
... Hegelschen Systems (1840)
Vorlesungen über Schelling (1842)
System der Wissenschaft (1850)
Meine Reform der Hegelschen Philosophie (1852)
Wissenschaft der logischen ...