Answer: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), and Calcium (Ca).
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)