未發現元素列表
總覽 > 第8周期

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| s區塊 | p區塊 | d區塊 | ds區塊 | f區塊 | g區塊 |
| 原子序数 | 元素符號 | IUPAC命名 | 族 | 電子組態 | 電子殼層 | 備註 |
| --- | --- | --- | --- | --- | --- | --- |
| 119 | Uue | Ununennium | s1 | [Uuo]8s1 | 2, 8, 18, 32, 32, 18, 8, 1 | 推測電負度小於0.7。 |
| 120 | Ubn | Unbinilium | s2 | [Og]8s2 | 2, 8, 18, 32, 32, 18, 8, 2 | 304Ubn之中子數為幻數，有人推測其半衰期可能較長。 |
| 121 | Ubu | Unbiunium | g1 | [Og]8s28p1 1/2 | 2, 8, 18, 32, 32, 18, 8, 3 | 第一個g區元素。 |
| 122 | Ubb | Unbibium | g2 | [Og]7d18s28p1 1/2 | 2, 8, 18, 32, 32, 18, 9, 3 |  |
| 123 | Ubt | Unbitrium | g3 | [Og]6f17d18s28p1 1/2 | 2, 8, 18, 32, 32, 19, 9, 3 |  |
| 124 | Ubq | Unbiquadium | g4 | [Og]6f38s28p1 1/2 | 2, 8, 18, 32, 32, 21, 8, 3 |  |
| 125 | Ubp | Unbipentium | g5 | [Og]5g16f38s28p1 1/2 | 2, 8, 18, 32, 33, 21, 8, 3 |  |
| 126 | Ubh | Unbihexium | g6 | [Og]5g26f27d18s28p1 1/2 | 2, 8, 18, 32, 34, 20, 9, 3 | 310Ubh同時擁有中子數184、質子數126兩個幻數，推測可能是穩定元素島中半衰期最長的一個。 |
| 127 | Ubs | Unbiseptium | g7 | [Og]5g36f28s28p2 1/2 | 2, 8, 18, 32, 35, 20, 8, 4 |  |
| 128 | Ubo | Unbioctium | g8 | [Og]5g46f28s28p2 1/2 | 2, 8, 18, 32, 36, 20, 8, 4 |  |
| 129 | Ube | Unbiennium | g9 | [Og]5g56f28s28p2 1/2 | 2, 8, 18, 32, 37, 20, 8, 4 |  |
| 130 | Utn | Untrinilium | g10 | [Og]5g66f28s28p2 1/2 | 2, 8, 18, 32, 38, 20, 8, 4 |  |
| 131 | Utu | Untriunium | g11 | [Og]5g76f28s28p2 1/2 | 2, 8, 18, 32, 39, 20, 8, 4 |  |
| 132 | Utb | Untribium | g12 | [Og]5g86f28s28p2 1/2 | 2, 8, 18, 32, 40, 20, 8, 4 |  |
| 133 | Utt | Untritrium | g13 | [Og]5g86f38s28p2 1/2 | 2, 8, 18, 32, 40, 21, 8, 4 |  |
| 134 | Utq | Untriquadium | g14 | [Og]5g86f48s28p2 1/2 | 2, 8, 18, 32, 40, 22, 8, 4 |  |
| 135 | Utp | Untripentium | g15 | [Og]5g96f48s28p2 1/2 | 2, 8, 18, 32, 41, 22, 8, 4 |  |
| 136 | Uth | Untrihexium | g16 | [Og]5g116f37d18s28p2 1/2 | 2, 8, 18, 32, 42, 22, 8, 4 |  |
| 137 | Uts | Untriseptium | g17 | [Og]5g126f37d18s28p2 1/2 | 2, 8, 18, 32, 43, 21, 9, 4 | 在波耳原子模型中，原子序超過137的原子在1s軌域的電子速度將超過光速；且根據狄拉克方程式，原子基態時的能量將成為虛數，為此費曼指出元素137可能是最後的一個元素，因此有人在非正式場合亦稱此元素為Feynmanium (Fy)。 |
| 138 | Uto | Untrioctium | g18 | [Og]5g126f37d18s28p2 1/2 | 2, 8, 18, 32, 44, 21, 9, 4 | 由於在實際情況中須考慮到原子核電荷分布的極限，因此在更精確的計算中，非離子態元素原子序可能達173。 |
| 139 | Ute | Untriennium | p1 | [Og]5g136f27d28s28p2 1/2 | 2, 8, 18, 32, 45, 20, 10, 4 |  |
| 140 | Uqn | Unquadnilium | p2 | [Og]5g146f37d18s28p2 1/2 | 2, 8, 18, 32, 46, 21, 9, 4 |  |
| 141 | Uqu | Unquadunium | f1 | [Og]5g156f27d28s28p2 1/2 | 2, 8, 18, 32, 47, 20, 10, 4 |  |
| 142 | Uqb | Unquadbium | f2 | [Og]5g166f27d28s28p2 1/2 | 2, 8, 18, 32, 48, 20, 10, 4 |  |
| 143 | Uqt | Unquadtrium | f3 | [Og]5g176f27d28s28p2 1/2 | 2, 8, 18, 32, 49, 20, 10, 4 |  |
| 144 | Uqq | Unquadquadium | f4 | [Og]5g186f17d38s28p2 1/2 | 2, 8, 18, 32, 50, 19, 11, 4 |  |
| 145 | Uqp | Unquadpentium | f5 | [Og]5g186f37d28s28p2 1/2 | 2, 8, 18, 32, 50, 21, 10, 4 |  |
| 146 | Uqh | Unquadhexium | f6 | [Og]5g186f47d28s28p2 1/2 | 2, 8, 18, 32, 50, 22, 10, 4 |  |
| 147 | Uqs | Unquadseptium | f7 | [Og]5g186f57d28s28p2 1/2 | 2, 8, 18, 32, 50, 23, 10, 4 |  |
| 148 | Uqo | Unquadoctium | f8 | [Og]5g186f67d28s28p2 1/2 | 2, 8, 18, 32, 50, 24, 10, 4 |  |
| 149 | Uqe | Unquadennium | f9 | [Og]5g186f67d38s28p2 1/2 | 2, 8, 18, 32, 50, 24, 11, 4 |  |
| 150 | Upn | Unpentnilium | f10 | [Og]5g186f67d48s28p2 1/2 | 2, 8, 18, 32, 50, 24, 12, 6 |  |
| 151 | Upu | Unpentunium | f11 | [Og]5g186f87d38s28p2 1/2 | 2, 8, 18, 32, 50, 26, 11, 4 |  |
| 152 | Upb | Unpentbium | f12 | [Og]5g186f97d38s28p2 1/2 | 2, 8, 18, 32, 50, 27, 11, 4 |  |
| 153 | Upt | Unpenttrium | f13 | [Og]5g186f117d28s28p2 1/2 | 2, 8, 18, 32, 50, 29, 10, 4 |  |
| 154 | Upq | Unpentquadium | f14 | [Og]5g186f127d28s28p2 1/2 | 2, 8, 18, 32, 50, 30, 10, 4 |  |
| 155 | Upp | Unpentpentium | d1 | [Og]5g186f137d28s28p2 1/2 | 2, 8, 18, 32, 50, 31, 10, 4 |  |
| 156 | Uph | Unpenthexium | d2 | [Og]5g186f147d28s28p2 1/2 | 2, 8, 18, 32, 50, 32, 10, 4 |  |
| 157 | Ups | Unpentseptium | d3 | [Og]5g186f147d38s28p2 1/2 | 2, 8, 18, 32, 50, 32, 11, 4 |  |
| 158 | Upo | Unpentoctium | d4 | [Og]5g186f147d48s28p2 1/2 | 2, 8, 18, 32, 50, 32, 12, 4 |  |
| 159 | Upe | Unpentennium | d5 | [Og]5g186f147d48s28p2 1/29s1 | 2, 8, 18, 32, 50, 32, 12, 4, 1 |  |
| 160 | Uhn | Unhexnilium | d6 | [Og]5g186f147d58s28p2 1/29s1 | 2, 8, 18, 32, 50, 32, 13, 4, 1 |  |
| 161 | Uhu | Unhexunium | d7 | [Og]5g186f147d68s28p2 1/29s1 | 2, 8, 18, 32, 50, 32, 14, 4, 1 |  |
| 162 | Uhb | Unhexbium | d8 | [Og]5g186f147d88s28p2 1/2 | 2, 8, 18, 32, 50, 32, 16, 4 |  |
| 163 | Uht | Unhextrium | d9 | [Og]5g186f147d98s28p2 1/2 | 2, 8, 18, 32, 50, 32, 17, 4 |  |
| 164 | Uhq | Unhexquadium | d10 | [Og]5g186f147d108s28p2 1/2 | 2, 8, 18, 32, 50, 32, 18, 4 |  |