Answer:

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