Reference Main

Periodic Table of Elements

Constants and Variables

Vapor Pressure of Water

Ionization Energies, Electron Affinities, and Electronegativities

Ionization Constants for Weak Acids at 25º C

Ionization Constants for Weak Bases at 25º C

Standard Reduction Potentials

Thermodynamic Values (A-C)

Thermodynamic Values (F-O)

Thermodynamic Values (P-Z)

Bibliography



Taken from R.E. Dickerson, H.B. Gray and G.P. Haight, "Chemical Principles," 3rd edition, Benjamin/Cummings Publishing, 1979

Ionization Energies, Electron Affinities, and Electronegativities of Selected Elements


Sorted by atomic number; to find a particular element, use your browser's search feature. Unfortunately, the electron affinities for many elements are not available.

Element (Symbol) Ionization Energy
kJ per mol 		Electron Affinity
kJ per mol		 Electronegativity
Hydrogen (H) 1310 67.4 2.20
Helium (He) 2372 -60.2 N/A
Lithium (Li) 519 77.0 0.984
Beryllium (Be) 900 -18.4 1.57
Boron (B) 799 31.8 2.046
Carbon (C) 1088 119.7 2.557
Nitrogen (N) 1406 4.6 3.048
Oxygen (O) 1314 141.8 3.449
Fluorine (F) 1682 349.4 3.9810
Neon (Ne) 2080 -54.8 N/A
Sodium (Na) 498 117.2 0.9312
Magnesium (Mg) 736 0 1.31
Aluminum (Al) 577 50.2 1.6114
Silicon (Si) 787 138.1 1.9015
Phosphorus (P) 1063 75.3 2.1916
Sulphur (S) 1000 199.6 2.5817
Chlorine (Cl) 1255 356.1 3.1618
Argon (Ar) 2372 -60.2 N/A
Potassium (K) 1310 67.4 2.2020
Calcium (Ca) 590 N/A 1.0021
Scandium (Sc) 632 N/A 1.3622
Titanium (Ti) 661 N/A 1.5423
Vanadium (V) 653 N/A 1.6324
Chromium (Cr) 653 N/A 1.6625
Manganese (Mn) 715 N/A 1.5526
Iron (Fe) 761 N/A 1.827
Cobalt (Co) 757 N/A 1.8828
Nickel (Ni) 736 N/A 1.9129
Copper (Cu) 745 N/A 1.9030
Zinc (Zn) 904 N/A 1.6531
Gallium (Ga) 577 N/A 1.8132
Germanium (Ge) 782 N/A 2.0133
Arsenic (As) 966 N/A 2.1834
Selenium (Se) 941 N/A 2.5535
Bromine (Br) 1142 333.0 2.9636
Krypton (Kr) 1351 N/A N/A
Rubidium (Rb) 402 N/A 0.8238
Strontium (Sr) 548 N/A 0.9539
Yttrium (Y) 636 N/A 1.2240
Zircon (Zr) 669 N/A 1.3341
Niobium (Nb) 653 N/A 1.642
Molybdenum (Mo) 695 N/A 2.1643
Technetium (Tc) 699 N/A 1.944
Rubidium (Ru) 724 N/A 2.2845
Rhodium (Rh) 745 N/A 2.246
Palladium (Pd) 803 N/A 2.2047
Silver (Ag) 732 N/A 1.9348
Cadmium (Cd) 866 N/A 1.6949
Indium (In) 556 N/A 1.7850
Tin (Sn) 707 N/A 1.9651
Antimony (Sb) 833 N/A 2.0552
Tellurium (Te) 870 N/A 2.153
Iodine (I) 1008 304.2 2.6654
Xenon (Xe) 1172 N/A N/A
Cesium (Cs) 377 N/A 0.7956
Barium (Ba) 502 N/A 0.8957
Lanthanum (La) 540 N/A 1.1072
Hafnium (Hf) 531 N/A 1.373
Tantalum (Ta) 577 N/A 1.574
Tungsten (W) 770 N/A 2.3675
Rhenium (Re) 761 N/A 1.976
Osmium (Os) 841 N/A 2.277
Iridium (Ir) 887 N/A 2.278
Platinum (Pt) 866 N/A 2.2879
Gold (Au) 891 N/A 2.5480
Mercury (Hg) 1008 N/A 2.0081
Thallium (Tl) 590 N/A 2.0482
Lead (Pb) 715 N/A 2.3383
Bismuth (Bi) 774 N/A 2.0284
Polonium (Po) N/A N/A 2.085
Astatine (At) N/A N/A 2.286
Radon (Rn) 1038 N/A N/A