oxygen
O
hydrogen
H
nitrogen
N
carbon
C
sodium
Na
potassium
K
lithium
Li
magnesium
Mg
calcium
Ca
barium
Ba
iron
Fe
copper
Cu
silver
Ag
chromium
Cr
cobalt
Co
zinc
Zn
gold
Au
radium
Ra
selenium
Se
xenon
Xe
strontium
Sr
platinum
Pt
fluorine
F
chlorine
Cl
aluminum
Al
sulfur
S
bromine
Br
iodine
I
mercury
Hg
helium
He
neon
Ne
phosphorus
P
silicon
Si
lead
Pb
uranium
U
cesium
Cs
nickel
Ni
manganese
Mn
plutonium
Pu
krypton
Kr
radon
Rn
boron
B
arsenic
As
tin
Sn