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| Hydrogen | Helium |
| Lithium | Beryllium |
| Boron | Carbon |
| Nitrogen | Oxygen |
| Symbol: He, Number: 2, Weight: 4.0026 | Symbol: H, Number: 1, Weight: 1.0079 |
| Symbol: Be, Number: 4, Weight: 9.01218 | Symbol: Li, Number: 3, Weight: 6.938 |
| Symbol: C, Number: 6, Weight: 12.0096 | Symbol: B, Number: 5, Weight: 10.806 |
| Symbol: O, Number: 8, Weight: 15.999 | Symbol: N, Number: 7, Weight: 14.0064 |
| Fluorine | Neon |
| Sodium | Magnesium |
| Aluminium | Silicon |
| Phosphorus | Sulfur |
| Symbol: Ne, Number: 10, Weight: 20.1797 | Symbol: F, Number: 9, Weight: 18.9984 |
| Symbol: Mg, Number: 12, Weight: 24.304 | Symbol: Na, Number: 11, Weight: 22.9898 |
| Symbol: Si, Number: 14, Weight: 28.084 | Symbol: Al, Number: 13, Weight: 26.9815 |
| Symbol: S, Number: 16, Weight: 32.059 | Symbol: P, Number: 15, Weight: 30.9738 |
| Chlorine | Argon |
| Potassium | Calcium |
| Scandium | Titanium |
| Vanadium | Chromium |
| Symbol: Ar, Number: 18, Weight: 39.792 | Symbol: Cl, Number: 17, Weight: 35.446 |
| Symbol: Ca, Number: 20, Weight: 40.0784 | Symbol: K, Number: 19, Weight: 39.0983 |
| Symbol: Ti, Number: 22, Weight: 47.8671 | Symbol: Sc, Number: 21, Weight: 44.9559 |
| Symbol: Cr, Number: 24, Weight: 51.9962 | Symbol: V, Number: 23, Weight: 50.9415 |
| Manganese | Iron |
| Cobalt | Nickel |
| Copper | Zinc |
| Gallium | Germanium |
| Symbol: Fe, Number: 26, Weight: 55.8452 | Symbol: Mn, Number: 25, Weight: 54.938 |
| Symbol: Ni, Number: 28, Weight: 58.6934 | Symbol: Co, Number: 27, Weight: 58.9332 |
| Symbol: Zn, Number: 30, Weight: 65.382 | Symbol: Cu, Number: 29, Weight: 63.546 |
| Symbol: Ge, Number: 32, Weight: 72.6308 | Symbol: Ga, Number: 31, Weight: 69.7231 |
| Arsenic | Selenium |
| Bromine | Krypton |
| Rubidium | Strontium |
| Yttrium | Zirconium |
| Symbol: Se, Number: 34, Weight: 78.9718 | Symbol: As, Number: 33, Weight: 74.9216 |
| Symbol: Kr, Number: 36, Weight: 83.798 | Symbol: Br, Number: 35, Weight: 79.901 |
| Symbol: Sr, Number: 38, Weight: 87.621 | Symbol: Rb, Number: 37, Weight: 85.4678 |
| Symbol: Zr, Number: 40, Weight: 91.2242 | Symbol: Y, Number: 39, Weight: 88.9058 |
| Niobium | Molybdenum |
| Technetium | Ruthenium |
| Rhodium | Palladium |
| Silver | Cadmium |
| Symbol: Mo, Number: 42, Weight: 95.951 | Symbol: Nb, Number: 41, Weight: 92.9064 |
| Symbol: Ru, Number: 44, Weight: 101.072 | Symbol: Tc, Number: 43, Weight: 98.9062 |
| Symbol: Pd, Number: 46, Weight: 106.421 | Symbol: Rh, Number: 45, Weight: 102.906 |
| Symbol: Cd, Number: 48, Weight: 112.414 | Symbol: Ag, Number: 47, Weight: 107.868 |
| Indium | Tin |
| Antimony | Tellurium |
| Iodine | Xenon |
| Cesium | Barium |
| Symbol: Sn, Number: 50, Weight: 118.711 | Symbol: In, Number: 49, Weight: 114.818 |
| Symbol: Te, Number: 52, Weight: 127.603 | Symbol: Sb, Number: 51, Weight: 121.76 |
| Symbol: Xe, Number: 54, Weight: 131.294 | Symbol: I, Number: 53, Weight: 126.904 |
| Symbol: Ba, Number: 56, Weight: 137.328 | Symbol: Cs, Number: 55, Weight: 132.905 |
| Lanthanum | Cerium |
| Praseodymium | Neodymium |
| Promethium | Samarium |
| Europium | Gadolinium |
| Symbol: Ce, Number: 58, Weight: 140.116 | Symbol: La, Number: 57, Weight: 138.905 |
| Symbol: Nd, Number: 60, Weight: 144.242 | Symbol: Pr, Number: 59, Weight: 140.908 |
| Symbol: Sm, Number: 62, Weight: 150.362 | Symbol: Pm, Number: 61, Weight: 145 |
| Symbol: Gd, Number: 64, Weight: 157.253 | Symbol: Eu, Number: 63, Weight: 151.964 |
| Terbium | Dysprosium |
| Holmium | Erbium |
| Thulium | Ytterbium |
| Lutetium | Hafnium |
| Symbol: Dy, Number: 66, Weight: 162.5 | Symbol: Tb, Number: 65, Weight: 158.925 |
| Symbol: Er, Number: 68, Weight: 167.259 | Symbol: Ho, Number: 67, Weight: 164.93 |
| Symbol: Yb, Number: 70, Weight: 173.045 | Symbol: Tm, Number: 69, Weight: 168.934 |
| Symbol: Hf, Number: 72, Weight: 178.492 | Symbol: Lu, Number: 71, Weight: 174.967 |
| Tantalum | Tungsten |
| Rhenium | Osmium |
| Iridium | Platinum |
| Gold | Mercury |
| Symbol: W, Number: 74, Weight: 183.841 | Symbol: Ta, Number: 73, Weight: 180.948 |
| Symbol: Os, Number: 76, Weight: 190.233 | Symbol: Re, Number: 75, Weight: 186.207 |
| Symbol: Pt, Number: 78, Weight: 195.085 | Symbol: Ir, Number: 77, Weight: 192.217 |
| Symbol: Hg, Number: 80, Weight: 200.592 | Symbol: Au, Number: 79, Weight: 196.967 |
| Thallium | Lead |
| Bismuth | Polonium |
| Astatine | Radon |
| Francium | Radium |
| Symbol: Pb, Number: 82, Weight: 207.21 | Symbol: Tl, Number: 81, Weight: 204.382 |
| Symbol: Po, Number: 84, Weight: 209 | Symbol: Bi, Number: 83, Weight: 208.98 |
| Symbol: Rn, Number: 86, Weight: 222 | Symbol: At, Number: 85, Weight: 210 |
| Symbol: Ra, Number: 88, Weight: 226 | Symbol: Fr, Number: 87, Weight: 223 |
| Actinium | Thorium |
| Protactinium | Uranium |
| Neptunium | Plutonium |
| Americium | Curium |
| Symbol: Th, Number: 90, Weight: 232.038 | Symbol: Ac, Number: 89, Weight: 227 |
| Symbol: U, Number: 92, Weight: 238.029 | Symbol: Pa, Number: 91, Weight: 231.036 |
| Symbol: Pu, Number: 94, Weight: 244 | Symbol: Np, Number: 93, Weight: 237 |
| Symbol: Cm, Number: 96, Weight: 247 | Symbol: Am, Number: 95, Weight: 243 |
| Berkelium | Californium |
| Einsteinium | Fermium |
| Mendelevium | Nobelium |
| Lawrencium | Rutherfordium |
| Symbol: Cf, Number: 98, Weight: 251 | Symbol: Bk, Number: 97, Weight: 247 |
| Symbol: Fm, Number: 100, Weight: 257 | Symbol: Es, Number: 99, Weight: 252 |
| Symbol: No, Number: 102, Weight: 259 | Symbol: Md, Number: 101, Weight: 258 |
| Symbol: Rf, Number: 104, Weight: 261 | Symbol: Lr, Number: 103, Weight: 262 |
| Dubnium | Seaborgium |
| Bohrium | Hassium |
| Meitnerium | Darmstadtium |
| Roentgenium | Copernicium |
| Symbol: Sg, Number: 106, Weight: 269 | Symbol: Db, Number: 105, Weight: 268 |
| Symbol: Hs, Number: 108, Weight: 269 | Symbol: Bh, Number: 107, Weight: 270.133 |
| Symbol: Ds, Number: 110, Weight: 281 | Symbol: Mt, Number: 109, Weight: 277.154 |
| Symbol: Cn, Number: 112, Weight: 285 | Symbol: Rg, Number: 111, Weight: 281 |
| Nihonium | Flerovium |
| Moscovium | Livermorium |
| Tennessine | Oganesson |
| Symbol: Fl, Number: 114, Weight: 289 | Symbol: Nh, Number: 113, Weight: 286 |
| Symbol: Lv, Number: 116, Weight: 293 | Symbol: Mc, Number: 115, Weight: 288 |
| Symbol: Og, Number: 118, Weight: 294 | Symbol: Ts, Number: 117, Weight: 294 |