元素周期表图表
元素电离能表
第一电离能是从气态中性原子中移去结合最弱的一个电子所需的能量。数值以电子伏特（eV）表示，表中同时给出 kJ/mol 数值。
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- 1H13.6
- 2He24.59
- 3Li5.39
- 4Be9.32
- 5B8.3
- 6C11.26
- 7N14.53
- 8O13.62
- 9F17.42
- 10Ne21.57
- 11Na5.14
- 12Mg7.65
- 13Al5.99
- 14Si8.15
- 15P10.49
- 16S10.36
- 17Cl12.97
- 18Ar15.76
- 19K4.34
- 20Ca6.11
- 21Sc6.56
- 22Ti6.83
- 23V6.75
- 24Cr6.77
- 25Mn7.43
- 26Fe7.9
- 27Co7.88
- 28Ni7.64
- 29Cu7.73
- 30Zn9.39
- 31Ga6
- 32Ge7.9
- 33As9.82
- 34Se9.75
- 35Br11.81
- 36Kr14
- 37Rb4.18
- 38Sr5.7
- 39Y6.22
- 40Zr6.63
- 41Nb6.76
- 42Mo7.09
- 43Tc7.28
- 44Ru7.36
- 45Rh7.46
- 46Pd8.34
- 47Ag7.58
- 48Cd8.99
- 49In5.79
- 50Sn7.34
- 51Sb8.64
- 52Te9.01
- 53I10.45
- 54Xe12.13
- 55Cs3.89
- 56Ba5.21
- 57La5.58
- 58Ce5.54
- 59Pr5.46
- 60Nd5.53
- 61Pm5.55
- 62Sm5.64
- 63Eu5.67
- 64Gd6.15
- 65Tb5.86
- 66Dy5.94
- 67Ho6.02
- 68Er6.11
- 69Tm6.18
- 70Yb6.25
- 71Lu5.43
- 72Hf6.83
- 73Ta7.89
- 74W7.98
- 75Re7.88
- 76Os8.7
- 77Ir9.1
- 78Pt9
- 79Au9.23
- 80Hg10.44
- 81Tl6.11
- 82Pb7.42
- 83Bi7.29
- 84Po8.42
- 85At9.5
- 86Rn10.75
- 87Fr3.9
- 88Ra5.28
- 89Ac5.17
- 90Th6.08
- 91Pa5.89
- 92U6.19
- 93Np6.27
- 94Pu6.06
- 95Am5.99
- 96Cm6.02
- 97Bk6.23
- 98Cf6.3
- 99Es6.42
- 100Fm6.5
- 101Md6.58
- 102No6.65
- 103Lr—
- 104Rf—
- 105Db—
- 106Sg—
- 107Bh—
- 108Hs—
- 109Mt—
- 110Ds—
- 111Rg—
- 112Cn—
- 113Nh—
- 114Fl—
- 115Mc—
- 116Lv—
- 117Ts—
- 118Og—
低高(eV)
无数据变化趋势
同一周期中，随着核电荷增加，电离能逐渐增大；同一族中从上到下，最外层电子离原子核越来越远，电离能逐渐减小。氦的电离能最高，碱金属最低，所以碱金属很容易失去一个电子。每个周期中有两处小幅下降打破这一规律：第 13 族（硼低于铍）和第 16 族（氧低于氮）。
全部元素的第一电离能
| 序号 | 元素 | 第一电离能 (eV) | kJ/mol |
|---|---|---|---|
| 1 | 氢 (H) | 13.6 | 1,312 |
| 2 | 氦 (He) | 24.59 | 2,372.3 |
| 3 | 锂 (Li) | 5.39 | 520.2 |
| 4 | 铍 (Be) | 9.32 | 899.5 |
| 5 | 硼 (B) | 8.3 | 800.6 |
| 6 | 碳 (C) | 11.26 | 1,086.5 |
| 7 | 氮 (N) | 14.53 | 1,402.3 |
| 8 | 氧 (O) | 13.62 | 1,313.9 |
| 9 | 氟 (F) | 17.42 | 1,681 |
| 10 | 氖 (Ne) | 21.57 | 2,080.7 |
| 11 | 钠 (Na) | 5.14 | 495.8 |
| 12 | 镁 (Mg) | 7.65 | 737.7 |
| 13 | 铝 (Al) | 5.99 | 577.5 |
| 14 | 硅 (Si) | 8.15 | 786.5 |
| 15 | 磷 (P) | 10.49 | 1,011.8 |
| 16 | 硫 (S) | 10.36 | 999.6 |
| 17 | 氯 (Cl) | 12.97 | 1,251.2 |
| 18 | 氩 (Ar) | 15.76 | 1,520.6 |
| 19 | 钾 (K) | 4.34 | 418.8 |
| 20 | 钙 (Ca) | 6.11 | 589.8 |
| 21 | 钪 (Sc) | 6.56 | 633.1 |
| 22 | 钛 (Ti) | 6.83 | 658.8 |
| 23 | 钒 (V) | 6.75 | 650.9 |
| 24 | 铬 (Cr) | 6.77 | 652.9 |
| 25 | 锰 (Mn) | 7.43 | 717.3 |
| 26 | 铁 (Fe) | 7.9 | 762.5 |
| 27 | 钴 (Co) | 7.88 | 760.4 |
| 28 | 镍 (Ni) | 7.64 | 737.1 |
| 29 | 铜 (Cu) | 7.73 | 745.5 |
| 30 | 锌 (Zn) | 9.39 | 906.4 |
| 31 | 镓 (Ga) | 6 | 578.8 |
| 32 | 锗 (Ge) | 7.9 | 762 |
| 33 | 砷 (As) | 9.82 | 947 |
| 34 | 硒 (Se) | 9.75 | 941 |
| 35 | 溴 (Br) | 11.81 | 1,139.9 |
| 36 | 氪 (Kr) | 14 | 1,350.8 |
| 37 | 铷 (Rb) | 4.18 | 403 |
| 38 | 锶 (Sr) | 5.7 | 549.5 |
| 39 | 钇 (Y) | 6.22 | 600 |
| 40 | 锆 (Zr) | 6.63 | 640.1 |
| 41 | 铌 (Nb) | 6.76 | 652.1 |
| 42 | 钼 (Mo) | 7.09 | 684.3 |
| 43 | 锝 (Tc) | 7.28 | 702 |
| 44 | 钌 (Ru) | 7.36 | 710.2 |
| 45 | 铑 (Rh) | 7.46 | 719.7 |
| 46 | 钯 (Pd) | 8.34 | 804.4 |
| 47 | 银 (Ag) | 7.58 | 731 |
| 48 | 镉 (Cd) | 8.99 | 867.8 |
| 49 | 铟 (In) | 5.79 | 558.3 |
| 50 | 锡 (Sn) | 7.34 | 708.6 |
| 51 | 锑 (Sb) | 8.64 | 834 |
| 52 | 碲 (Te) | 9.01 | 869.3 |
| 53 | 碘 (I) | 10.45 | 1,008.4 |
| 54 | 氙 (Xe) | 12.13 | 1,170.4 |
| 55 | 铯 (Cs) | 3.89 | 375.7 |
| 56 | 钡 (Ba) | 5.21 | 502.9 |
| 57 | 镧 (La) | 5.58 | 538.1 |
| 58 | 铈 (Ce) | 5.54 | 534.4 |
| 59 | 镨 (Pr) | 5.46 | 527 |
| 60 | 钕 (Nd) | 5.53 | 533.1 |
| 61 | 钷 (Pm) | 5.55 | 540 |
| 62 | 钐 (Sm) | 5.64 | 544.5 |
| 63 | 铕 (Eu) | 5.67 | 547.1 |
| 64 | 钆 (Gd) | 6.15 | 593.4 |
| 65 | 铽 (Tb) | 5.86 | 565.8 |
| 66 | 镝 (Dy) | 5.94 | 573 |
| 67 | 钬 (Ho) | 6.02 | 581 |
| 68 | 铒 (Er) | 6.11 | 589.3 |
| 69 | 铥 (Tm) | 6.18 | 596.7 |
| 70 | 镱 (Yb) | 6.25 | 603.4 |
| 71 | 镥 (Lu) | 5.43 | 523.5 |
| 72 | 铪 (Hf) | 6.83 | 658.5 |
| 73 | 钽 (Ta) | 7.89 | 761 |
| 74 | 钨 (W) | 7.98 | 770 |
| 75 | 铼 (Re) | 7.88 | 760 |
| 76 | 锇 (Os) | 8.7 | 840 |
| 77 | 铱 (Ir) | 9.1 | 880 |
| 78 | 铂 (Pt) | 9 | 870 |
| 79 | 金 (Au) | 9.23 | 890.1 |
| 80 | 汞 (Hg) | 10.44 | 1,007.1 |
| 81 | 铊 (Tl) | 6.11 | 589.4 |
| 82 | 铅 (Pb) | 7.42 | 715.6 |
| 83 | 铋 (Bi) | 7.29 | 703 |
| 84 | 钋 (Po) | 8.42 | 812.1 |
| 85 | 砹 (At) | 9.5 | 899 |
| 86 | 氡 (Rn) | 10.75 | 1,037 |
| 87 | 钫 (Fr) | 3.9 | 380 |
| 88 | 镭 (Ra) | 5.28 | 509.3 |
| 89 | 锕 (Ac) | 5.17 | 499 |
| 90 | 钍 (Th) | 6.08 | 587 |
| 91 | 镤 (Pa) | 5.89 | 568 |
| 92 | 铀 (U) | 6.19 | 597.6 |
| 93 | 镎 (Np) | 6.27 | 604.5 |
| 94 | 钚 (Pu) | 6.06 | 584.7 |
| 95 | 镅 (Am) | 5.99 | 578 |
| 96 | 锔 (Cm) | 6.02 | 581 |
| 97 | 锫 (Bk) | 6.23 | 601 |
| 98 | 锎 (Cf) | 6.3 | 608 |
| 99 | 锿 (Es) | 6.42 | 619 |
| 100 | 镄 (Fm) | 6.5 | 627 |
| 101 | 钔 (Md) | 6.58 | 635 |
| 102 | 锘 (No) | 6.65 | 642 |
| 103 | 铹 (Lr) | — | 470 |
| 104 | 𬬻 (Rf) | — | 580 |
| 105 | 𬭊 (Db) | — | — |
| 106 | 𬭳 (Sg) | — | — |
| 107 | 𬭛 (Bh) | — | — |
| 108 | 𬭶 (Hs) | — | — |
| 109 | 鿏 (Mt) | — | — |
| 110 | 𫟼 (Ds) | — | — |
| 111 | 𬬭 (Rg) | — | — |
| 112 | 鿔 (Cn) | — | — |
| 113 | 鿭 (Nh) | — | — |
| 114 | 𫓧 (Fl) | — | — |
| 115 | 镆 (Mc) | — | — |
| 116 | 𫟷 (Lv) | — | — |
| 117 | 鿬 (Ts) | — | — |
| 118 | 鿫 (Og) | — | — |