Standard Enthalpies of Formation of Gaseous Atoms
| Atom | ΔHf°(g) kJ/mol |
|---|---|
| Actinium | 385 |
| Aluminum | 326 |
| Antimony | 262 |
| Argon | 0 |
| Arsenic | 302 |
| Astatine | 92 |
| Barium | 180 |
| Beryllium | 324 |
| Bismuth | 207 |
| Boron | 573 |
| Bromine | 112 |
| Cadmium | 112 |
| Calcium | 178 |
| Carbon | 717 |
| Cerium | 422 |
| Cesium | 79 |
| Chlorine | 121 |
| Chromium | 397 |
| Cobalt | 425 |
| Copper | 338 |
| Dysprosium | 297 |
| Erbium | 318 |
| Europium | 176 |
| Atom | ΔHf°(g) kJ/mol |
|---|---|
| Fluorine | 79 |
| Francium | 92 |
| Gadolinium | 397 |
| Gallium | 286 |
| Germanium | 377 |
| Gold | 366 |
| Hafnium | 619 |
| Helium | 0 |
| Holmium | 301 |
| Hydrogen | 218 |
| Indium | 243 |
| Iodine | 107 |
| Iridium | 665 |
| Iron | 418 |
| Krypton | 0 |
| Lanthanum | 423 |
| Lead | 196 |
| Lithium | 161 |
| Lutecium | 426 |
| Magnesium | 148 |
| Manganese | 281 |
| Mercury | 61 |
| Molybdenum | 658 |
| Atom | ΔHf°(g) kJ/mol |
|---|---|
| Neodymium | 322 |
| Neon | 0 |
| Neptunium | 439 |
| Nickel | 430 |
| Niobium | 726 |
| Nitrogen | 473 |
| Osmium | 791 |
| Oxygen | 249 |
| Palladium | 378 |
| Phosphorus | 315 |
| Platinum | 565 |
| Polonium | 144 |
| Potassium | 90 |
| Praseodymium | 355 |
| Protactinium | 527 |
| Radium | 159 |
| Radon | 0 |
| Rhenium | 770 |
| Rhodium | 556 |
| Rubidium | 86 |
| Ruthenium | 643 |
| Samarium | 205 |
| Scandium | 378 |
| Atom | ΔHf°(g) kJ/mol |
|---|---|
| Selenium | 227 |
| Silicon | 452 |
| Silver | 284 |
| Sodium | 109 |
| Strontium | 164 |
| Sulfur | 279 |
| Tantalum | 782 |
| Technetium | 677 |
| Tellurium | 197 |
| Terbium | 389 |
| Thallium | 182 |
| Thorium | 576 |
| Thulium | 230 |
| Tin | 302 |
| Titanium | 470 |
| Tungsten | 849 |
| Uranium | 490 |
| Vanadium | 514 |
| Xenon | 0 |
| Ytterbium | 150 |
| Ytterium | 423 |
| Zinc | 131 |
| Zirconium | 609 |
Reference: W.E. Dasent, "Inorganic Energetics," 2nd ed., Cambridge University Press, NY, 1982, p. 35