mendelvium
md
gadolinium
gd
plutonium
pu
meitnerium
mt
roentgenium
rg
darmstadtium
ds
actinium
ac
hassium
hs
copernicium
cn
thorium
th
cm
curium
terbium
tb
fermium
fm
neodymium
nd
livermorium
lv
praseodymium
pr
lutetium
lu
berkelium
bk
lawrencium
lr
ytterbium
yb
erbium
er
protactinium
pa