Periodic Elements

First Period
Hydrogen (H), Helium (He)
Second Period
Lithium (Li), Beryllium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (Fl), Neon (Ne)
Third Period
Sodium (Na), Magnesium (Mg), Aluminum (Al), SIlicon (Si), Phosphorus (P), Sulfure (S), Chlorine (Cl), Argon (Ar)
Fourth Period
Potassium (K), Calcium (Ca), Scandium (Sc), Titanium (Ti), Vanadium (V), Chromium (Cr), Manganese (Mn), Iron (Fe), Cobalt (Co), Nickel (Ni), Copper (Cu), Zinc (Zn), Gallium (Ga), Germanium (Ge), Arsenic (As), Selenium (Se), Bromine (Br), Krypton (Kr)
Alkali Metals
Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Francium (Fr)
Alkaline Earth Metals
Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), Radium (Ra)
Halogens
Fluorine (Fl), Chlorine (Cl), Bromine (Br), Iodine (I), Astatine (At)
Noble Gases
Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn)
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