Hydrogen
H
helium
He
lithium
Li
berylium
Be
boron
B
carbon
C
nitrogen
N
oxygen
O
fluorine
F
neon
Ne
sodium
Na
magnesium
Mg
aluminum
Al
silicon
Si
phosphorus
P
sulfur
S
chlorine
Cl
argon
Ar
potassium
K
calcium
Ca
titanium
Ti
chromium
Cr
manganese
Mn
iron
Fe