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键能与正极强度成正比，与键长成反比。 键长、键能表（1.01×105Pa和25℃） 序号 | 键 | 负极强度 | 正极强度 | 键长(pm) | 键能（j） | 键能(kj/mol) | 1氢 | H-F | 4.68 | 9.92 | 92 | 9.38×10-19 | 565 |
| H-O | 4.68 | 7.76 | 98 | 8.02×10-19 | 482.9 |
| H-Cl | 4.68 | 6.64 | 127 | 7.17×10-19 | 431.8 |
| H-Br | 4.68 | 5.84 | 142 | 6.08×10-19 | 366 |
| H-H | 4.68 | 4.68 | 75 | 7.24×10-19 | 436 |
| H-I | 4.68 | 4.64 | 161 | 4.95×10-19 | 298 |
| H-S | 4.68 | 4.32 | 135 | 5.63×10-19 | 339 |
| H-Se | 4.68 | 4.20 | 147 | 5.22×10-19 | 314 | 3锂 | Li-Cl | 8.08 | 6.64 | 202 | 7.79×10-19 | 469 |
| Li-H | 8.08 | 4.68 | 239 | 3.95×10-19 | 238 |
| Li-I | 8.08 | 4.64 | 238 | 5.73×10-19 | 345 | 5硼 | B-F | 2.16 | 9.92 | - | 10.70×10-19 | 644 |
| B-O | 2.16 | 7.76 | - | 8.55×10-19 | 515 | 6碳 | C-F | 4.20 | 9.92 | 138 | 8.06×10-19 | 485 |
| O=C=O | 4.20 | 7.76 | - | 13.34×10-19 | 803 |
| C=O | 4.20 | 7.76 | 120 | 12.09×10-19 | 728 |
| C-O | 4.20 | 7.76 | 143 | 5.42×10-19 | 326 |
| C-Cl | 4.20 | 6.64 | 177 | 5.45×10-19 | 328 |
| C≡N | 4.20 | 6.16 | 116 | 14.80×10-19 | 891 |
| C=N | 4.20 | 6.16 | 135 | 10.22×10-19 | 615 |
| C-N | 4.20 | 6.16 | 148 | 5.06×10-19 | 305 |
| C-Br | 4.20 | 5.84 | 194 | 4.58×10-19 | 276 |
| C-H | 4.20 | 4.68 | 109 | 6.89×10-19 | 415 |
| C-I | 4.20 | 4.64 | 214 | 3.99×10-19 | 240 |
| S=C=S | 4.20 | 4.32 | - | 9.58×10-19 | 577 |
| C=S | 4.20 | 4.32 | 156 | 8.90×10-19 | 536 |
| C-S | 4.20 | 4.32 | 182 | 4.52×10-19 | 272 |
| C≡C | 4.20 | 4.20 | 120 | 13.90×10-19 | 837 |
| C=C | 4.20 | 4.20 | 134 | 10.15×10-19 | 611 |
| C-C | 4.20 | 4.20 | 154 | 5.78×10-19 | 347.7 |
| C-Si | 4.20 | 4.08 | 186 | 5.76×10-19 | 347 |
| C-P | 4.20 | 3.24 | 187 | 5.07×10-19 | 305 |
| C-B | 4.20 | 2.16 | 156 | 6.53×10-19 | 393 | 7氮 | N=O | 6.16 | 7.76 | 114 | 10.08×10-19 | 607 |
| N-O | 6.16 | 7.76 | 146 | 3.82×10-19 | 230 |
| N≡N | 6.16 | 6.16 | 110 | 15.71×10-19 | 946 |
| N=N | 6.16 | 6.16 | 125 | 7.57×10-19 | 456 |
| N-N | 6.16 | 6.16 | 145 | 2.64×10-19 | 159 |
| N-H | 6.16 | 4.68 | 101 | 6.46×10-19 | 389 | 8氧 | O=O | 7.76 | 7.76 | 120 | 8.23×10-19 | 496 |
| O-O | 7.76 | 7.76 | 148 | 2.43×10-19 | 146 | 9氟 | F-F | 9.92 | 9.92 | 140 | 2.54×10-19 | 153 | 11钠 | Na-F | 8.28 | 9.92 | 193 | 8.62×10-19 | 519 |
| Na-Cl | 7.72 | 6.64 | 236 | 6.84×10-19 | 412 |
| Na-Br | 7.72 | 5.84 | 250 | 6.70×10-19 | 367 |
| Na-H | 8.28 | 4.68 | 189 | 3.09×10-19 | 186 |
| Na-I | 8.28 | 4.64 | 271 | 5.05×10-19 | 304 | 14硅 | Si-F | 4.08 | 9.92 | - | 9.17×10-19 | 552 |
| Si-O | 4.08 | 7.76 | 161 | 7.64×10-19 | 460 |
| Si-Cl | 4.08 | 6.64 | - | 5.98×10-19 | 360 |
| Si-H | 4.08 | 4.68 | - | 6.26×10-19 | 377 |
| Si-Si | 4.08 | 4.08 | 235.2 | 2.92×10-19 | 176 | 15磷 | P=O | 3.24 | 7.76 | 138 | 9.72×10-19 | 585 |
| P-O | 3.24 | 7.76 | 163 | 6.81×10-19 | 410 |
| P-Cl | 3.24 | 6.64 | 203 | 5.50×10-19 | 331 |
| P-Br | 3.24 | 5.84 | 220 | 4.52×10-19 | 272 |
| P-P | 3.24 | 3.24 | - | 3.54×10-19 | 213 |
| P-H | 3.24 | 4.68 | 142 | 5.35×10-19 | 322 | 16硫 | S=O | 4.32 | 7.76 | 143 | 8.72×10-19 | 525 |
| S-O | 4.32 | 7.76 | - | 6.05×10-19 | 364 |
| S=S | 4.32 | 4.32 | 189 |
| - |
| S-S | 4.32 | 4.32 | 207 | 4.45×10-19 | 268 | 17氯 | Cl-Cl | 6.64 | 6.64 | 199 | 4.03×10-19 | 242.7 | 19钾 | K-F | 7.28 | 9.92 | 217 | 8.27×10-19 | 498 |
| K-Cl | 7.28 | 6.64 | 267 | 7.19×10-19 | 433 |
| K-Br | 7.28 | 5.84 | 282 | 6.31×10-19 | 380 |
| K-I | 7.28 | 4.64 | 305 | 5.40×10-19 | 325 | 34硒 | Se=Se | 4.20 | 4.20 | 215 |
| - |
| Se-Se | 4.20 | 4.20 | 232 |
| - | 35溴 | Br-Br | 5.84 | 5.84 | 229 | 3.22×10-19 | 193.7 | 37铷 | Rb-F | 8.72 | 9.92 | 227 | 8.21×10-19 | 494 |
| Rb-Cl | 8.72 | 6.64 | 279 | 7.11×10-19 | 428 |
| Rb-Br | 8.72 | 5.84 | 294 | 6.33×10-19 | 381 |
| Rb-I | 8.72 | 4.64 | 318 | 5.30×10-19 | 319 | 53碘 | I-I | 4.64 | 4.64 | 266 | 2.54×10-19 | 152.7 | 55铯 | Cs-I | 7.84 | 4.64 | 337 | 5.60×10-19 | 337 | 82铅 | Pb-O | 1.68 | 7.76 | 192 | 6.35×10-19 | 382 |
| Pb-S | 1.68 | 4.32 | 239 | 5.75×10-19 | 346 |
注：表中的键长、键能都是平均值。
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