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Fer
Fe, 26
Cobalt
Co, 27
Nickel
Ni, 28
Cuivre
Cu, 29
Zinc
Zn, 30
Gallium
Ga, 31
Germanium
Ge, 32
Arsenic
As, 33
Sélénium
Se, 34
Brome
Br, 35
Krypton
Kr, 36
Rubidium
Rb, 37
Strontium
Sr, 38
Yttrium
Y, 39
Zirconium
Zr, 40
Niobium
Nb, 41
Molybdène
Mo, 42
Technétium
Tc, 43
Ruthénium
Ru, 44
Rhodium
Rh, 45
Palladium
Pd, 46
Argent
Ag, 47
Cadmium
Cd, 48
Indium
In, 49
Etain
Sn, 50