To find how many elements have two letters in their symbol, we need to check the periodic table
- An element symbol consists of one or two letters, with the first letter always capitalized and the second (if present) lowercase.
After reviewing the periodic table, there are 118 known elements, and the following elements have two-letter symbols:
Aluminum (Al)
Argon (Ar)
Barium (Ba)
Beryllium (Be)
Bromine (Br)
Calcium (Ca)
Carbon (C)
Cobalt (Co)
Copper (Cu)
Fluorine (F)
Gallium (Ga)
Germanium (Ge)
Hafnium (Hf)
Holmium (Ho)
Iron (Fe)
Krypton (Kr)
Lanthanum (La)
Lead (Pb)
Lithium (Li)
Molybdenum (Mo)
Neon (Ne)
Nickel (Ni)
Oxygen (O)
Palladium (Pd)
Phosphorus (P)
Platinum (Pt)
Plutonium (Pu)
Radon (Rn)
Rhodium (Rh)
Rubidium (Rb)
Selenium (Se)
Silicon (Si)
Silver (Ag)
Sodium (Na)
Strontium (Sr)
Sulfur (S)
Tantalum (Ta)
Tellurium (Te)
Thorium (Th)
Thallium (Tl)
Titanium (Ti)
Uranium (U)
Vanadium (V)
Xenon (Xe)
There are 53 elements in total with two-letter symbols.