Atomic Number: 11
SODIUM
Na
Atomic Number: 12
MAGNESIUM
Mg
Atomic Number: 13
ALUMINIUM
Al
Atomic Number: 14
SILICON
Si
Atomic Number: 15
PHOSPHORUS
P
Atomic Number: 16
SULPHUR
S
Atomic Number: 17
CHLORINE
Cl
Atomic Number: 18
ARGON
Ar
Atomic Number: 19
POTASSIUM
K
Atomic Number: 20
CALCIUM
CA