H
HYDROGEN 1
He
HELIUM 2
Li
LITHIUM 3
Be
BERYLLIUM 4
B
BORON 5
C
CARBON 6
N
NITROGEN 7
O
OXYGEN 8
F
FLOURINE 9
Ne
NEON10
Na
SODIUM 11
Mg
MAGNESIUM 12
Si
SILICON 14
P
PHOSOPHOROUS 15
S
SULPHUR 16
Cl
CHLORINE 17
Ar
ARGON 18
K
POTASSIUM 19
Ca
CALCIUM 20
Al
ALUMINUM 13