Subject
metal organic compound
6
rare earth organic compound
5
lithium
2
actinide
1
actinium
1
aluminum
1
barium
1
beryllium
1
cadmium
1
calcium organic compound
1
chromium
1
copper
1
gallium
1
germanium
1
gold
1
hafnium
1
indium
1
lanthanum
1
lead
1
manganese
1
mercury
1
molybdenum
1
rhenium
1
scandium
1
silver
1
tantalum
1
technetium
1
tin
1
titanium
1
vanadium
1
yttrium
1
zinc
1
zirconium
1