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Group 9 element
Group 9
in the periodic table
group 8
←
→
group 10
IUPAC group number
9
Name by element
cobalt group
CAS group number
(US, pattern A-B-A)
part of VIIIB
old IUPAC number
(Europe, pattern A-B)
part of VIII
↓
Period
4
Cobalt
(Co)
27
Transition metal
5
Rhodium
(Rh)
45
Transition metal
6
Iridium
(Ir)
77
Transition metal
7
Meitnerium
(Mt)
109
unknown chemical properties
Legend
primordial element
synthetic element
Atomic number color:
black=solid
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