Respuesta :

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