H (1)
Hydrogen
He (2)
Helium
Li (3)
Lithium
Be (4)
Beryllium
B (5)
Boron
C (6)
Carbon
N (7)
Nitrogen
O (8)
Oxygen
F (9)
Fluorine
Ne (10)
Neon
Na (11)
Sodium
Mg (12)
Magnesium
Al (13)
Aluminum
Si (14)
Silicon
P (15)
Phosphorus
S (16)
Sulfur
Cl (17)
Chlorine
Ar (18)
Argon
K (19)
Potassium
Ca (20)
Calcium