However, molecular complexes, organometallic compounds, and
solid-s
fied into the d-block metals, which
consis
and Y belong to the d-block, their
proper
ences in properties between the
seco
cond and third series may be
7 to 9 coordinate. Cerium, Ce, (radius 182 pm) ~ lutetium, Lu, (radius 175 pm) fall
nd Hf and, because of the lanthanide contraction, metallic radii of the
seco
tate compounds such as oxides, sulfides, and halides of transition metals are used in the most active research areas in modern inorganic chemistry.