Metals:
* 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)
* Transition Metals: Scandium (Sc), Titanium (Ti), Vanadium (V), Chromium (Cr), Manganese (Mn), Iron (Fe), Cobalt (Co), Nickel (Ni), Copper (Cu), Zinc (Zn), Yttrium (Y), Zirconium (Zr), Niobium (Nb), Molybdenum (Mo), Technetium (Tc), Ruthenium (Ru), Rhodium (Rh), Palladium (Pd), Silver (Ag), Cadmium (Cd), Hafnium (Hf), Tantalum (Ta), Tungsten (W), Rhenium (Re), Osmium (Os), Iridium (Ir), Platinum (Pt), Gold (Au), Mercury (Hg) (Note: Mercury is a liquid at room temperature, but it is technically a transition metal)
* Lanthanides: Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Samarium (Sm), Europium (Eu), Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Ytterbium (Yb), Lutetium (Lu)
* Actinides: Actinium (Ac), Thorium (Th), Protactinium (Pa), Uranium (U), Neptunium (Np), Plutonium (Pu), Americium (Am), Curium (Cm), Berkelium (Bk), Californium (Cf), Einsteinium (Es), Fermium (Fm), Mendelevium (Md), Nobelium (No), Lawrencium (Lr)
Nonmetals:
* Boron Group: Boron (B)
* Carbon Group: Carbon (C), Silicon (Si), Germanium (Ge), Tin (Sn), Lead (Pb)
* Nitrogen Group: Nitrogen (N), Phosphorus (P), Arsenic (As), Antimony (Sb), Bismuth (Bi)
* Oxygen Group: Oxygen (O), Sulfur (S), Selenium (Se)
* Halogens: Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), Astatine (At)
* Noble Gases: Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn)
Metalloids:
* Boron (B)
* Silicon (Si)
* Germanium (Ge)
* Arsenic (As)
* Antimony (Sb)
* Tellurium (Te)
* Polonium (Po)
Note: Some elements can exist in different forms (allotropes) at room temperature. For example, carbon can be found as graphite or diamond, both of which are solid.
