nitrogen
n
fluorine
f
iodine
i
phosphorous
p
sulfur
s
uranium
u
bromine
br
helium
he
xenon
xe
beryllium
be
radium
ra
chlorine
cl
magnesium
mg
chromium
cr
zinc
zn
arsenic
as
radon
rn
silver
ag
mercury
hg
iron
fe
sodium
na
copper
cu
potassium
k
tungsten
w