H – Hydrogen.
He – Helium.
Li – Lithium.
Be – Beryllium.
B – Boron.
C – Carbon.
N – Nitrogen.
O – Oxygen.
F – Fluorine.
Ne – Neon.
Na – Sodium.
Mg – Magnesium.
Al – Aluminium.
Si – Silicon.
P – Phosphorus.
S – Sulphur.
Cl – Chlorine.
Ar – Argon.
K – Potassium.
Ca – Calcium.