Rb
rubidium
Sr
strontium
Y
yttrium
Zr
ziroonium
Nb
niobium
Mo
molybdenum
Tc
technetium
Ru
ruthenium
Pd
palladium
Ag
silver
Cd
cadmium
In
indium
Sn
tin
Sb
antimony
Te
tellurium
I
iodine
Xe
xenon
Rh
rhodium