Rb
rubidium
Sr
strontium
Y
yttrium
Zr
zirconium
Nb
niobium
Mo
molybdenum
Tc
technetium
Ru
ruthenium
Rh
rhodium
Pd
palladium
Ag
silver
Cd
cadmium
In
indium
Sn
tin
Sb
antinomy
Te
tellurium
I
iodine
Xe
xenon
Cs
cesium
Ba
barium
La
lanthanum
Ce
cerium
Pr
praseodymium
Nd
neodymium