未發現元素列表

未發現元素是一些在元素周期表內，未被列出的元素。目前所有已被發現的人造元素，在未發現之前也都可被稱之為未發現元素，基於目前化學理論漸趨完備，我們可以依此對未發現元素作一些基本性質上的推論。由於理論推測最大的原子質子數不得超過210，故下表所列之預測元素就僅至第九週期；而截至2022年為止，最新發現（于2010年）之元素為鿬（Tennessine, Ts）^[1]，并经IUPAC正式承認，至此所有第七週期元素已经合成成功，下表不予以保留。

通常科學家用實驗室的所在地或名稱來命名新發現的元素，國際純粹與應用化學聯合會（IUPAC）亦會給予已發現之元素名稱正式的認可。但IUPAC為統一起見，對於所有未經核定但已發現或被預測的元素名稱一律依照IUPAC之命名法則制定暫定名稱，使用拉丁文數字頭以該元素之原子序來命名，如Biunseptium（Bus）便是由bi（二）- un（一）- sept（七）- ium（元素）四個字根組合而成，表示「元素217號」。詳細的法則請見IUPAC元素系統命名法。以下所列即為未發現元素的IUPAC暫定名稱。

目前實驗合成原子序最大的元素可能是第七週期的最後一個元素₁₁₈Og，而若發現了原子序数更大的元素則將被置於第八週期。根據格倫·西奧多·西博格於1969年提出的擴展元素週期表^[2]，在第八週期以後的週期中，將會有g區元素的出現，即有部份的元素會存在有g軌域的電子，然而第八週期以後的元素都尚未能被合成或發現，所以此理論迄今未能被驗證。

我們可以預測下表的g區元素可能位於f區元素的左方，下表先依主流予以採用︰

多篇論文中對於其周期皆有不同表述之元素者，或者無論文或研究提到其周期者，列於此。

化學元素			元素分區	預測电子排布[9][6][10][11]
119	Uue	Ununennium	s-block	[Og] 8s1
120	Ubn	Unbinilium	s-block	[Og] 8s2
121	Ubu	Unbiunium	g-block	[Og] 8s2 8p1 1/2[12]
122	Ubb	Unbibium	g-block	[Og] 8s2 8p2 1/2[12] [Og] 7d1 8s2 8p1 1/2
123	Ubt	Unbitrium	g-block	[Og] 6f1 8s2 8p2 1/2[13] [Og] 6f1 7d1 8s2 8p1 1/2[14][12] [Og] 6f2 8s2 8p1 1/2 [Og] 8s2 8p2 1/2 8p1 3/2[14]
124	Ubq	Unbiquadium	g-block	[Og] 6f2 8s2 8p2 1/2[12][13] [Og] 6f3 8s2 8p1 1/2
125	Ubp	Unbipentium	g-block	[Og] 6f4 8s2 8p1 1/2[12] [Og] 5g1 6f2 8s2 8p2 1/2[13] [Og] 5g1 6f3 8s2 8p1 1/2 [Og] 8s2 0.81(5g1 6f2 8p2 1/2) + 0.17(5g1 6f1 7d2 8p1 1/2) + 0.02(6f3 7d1 8p1 1/2)
126	Ubh	Unbihexium	g-block	[Og] 5g1 6f4 8s2 8p1 1/2[12] [Og] 5g2 6f2 8s2 8p2 1/2[13] [Og] 5g2 6f3 8s2 8p1 1/2 [Og] 8s2 0.998(5g2 6f3 8p1 1/2) + 0.002(5g2 6f2 8p2 1/2)
127	Ubs	Unbiseptium	g-block	[Og] 5g2 6f3 8s2 8p2 1/2[12] [Og] 5g3 6f2 8s2 8p2 1/2[13] [Og] 8s2 0.88(5g3 6f2 8p2 1/2) + 0.12(5g3 6f1 7d2 8p1 1/2)
128	Ubo	Unbioctium	g-block	[Og] 5g3 6f3 8s2 8p2 1/2[12] [Og] 5g4 6f2 8s2 8p2 1/2[13] [Og] 8s2 0.88(5g4 6f2 8p2 1/2) + 0.12(5g4 6f1 7d2 8p1 1/2)
129	Ube	Unbiennium	g-block	[Og] 5g4 6f3 7d1 8s2 8p1 1/2 [Og] 5g4 6f3 8s2 8p2 1/2[12][13] [Og] 5g5 6f2 8s2 8p2 1/2 [Og] 5g4 6f3 7d1 8s2 8p1 1/2
130	Utn	Untrinilium	g-block	[Og] 5g5 6f3 7d1 8s2 8p1 1/2 [Og] 5g5 6f3 8s2 8p2 1/2[12][13] [Og] 5g6 6f2 8s2 8p2 1/2 [Og] 5g5 6f3 7d1 8s2 8p1 1/2
131	Utu	Untriunium	g-block	[Og] 5g6 6f3 8s2 8p2 1/2[12][13] [Og] 5g7 6f2 8s2 8p2 1/2 [Og] 8s2 0.86(5g6 6f3 8p2 1/2) + 0.14(5g6 6f2 7d2 8p1 1/2)
132	Utb	Untribium	g-block	[Og] 5g7 6f3 8s2 8p2 1/2[13] [Og] 5g8 6f2 8s2 8p2 1/2
133	Utt	Untritrium	g-block	[Og] 5g8 6f3 8s2 8p2 1/2[13]
134	Utq	Untriquadium	g-block	[Og] 5g8 6f4 8s2 8p2 1/2[13]
135	Utp	Untripentium	g-block	[Og] 5g9 6f4 8s2 8p2 1/2[13]
136	Uth	Untrihexium	g-block	[Og] 5g10 6f4 8s2 8p2 1/2[13]
137	Uts	Untriseptium	g-block	[Og] 5g11 6f4 8s2 8p2 1/2[13]
138	Uto	Untrioctium	g-block	[Og] 5g12 6f4 8s2 8p2 1/2[13] [Og] 5g12 6f3 7d1 8s2 8p2 1/2
139	Ute	Untriennium	g-block	[Og] 5g13 6f3 7d1 8s2 8p2 1/2[13] [Og] 5g13 6f2 7d2 8s2 8p2 1/2
140	Uqn	Unquadnilium	g-block	[Og] 5g14 6f3 7d1 8s2 8p2 1/2[13] [Og] 5g15 6f1 8s2 8p2 1/2 8p2 3/2
141	Uqu	Unquadunium	g-block	[Og] 5g15 6f2 7d2 8s2 8p2 1/2[13]
142	Uqb	Unquadbium	g-block	[Og] 5g16 6f2 7d2 8s2 8p2 1/2[13]
143	Uqt	Unquadtrium	f-block	[Og] 5g17 6f2 7d2 8s2 8p2 1/2[13]
144	Uqq	Unquadquadium	f-block	[Og] 5g18 6f2 7d2 8s2 8p2 1/2[13] [Og] 5g18 6f1 7d3 8s2 8p2 1/2 [Og] 5g17 6f2 7d3 8s2 8p2 1/2 [Og] 8s2 0.95(5g17 6f2 7d3 8p2 1/2) + 0.05(5g17 6f4 7d1 8p2 1/2)
145	Uqp	Unquadpentium	f-block	[Og] 5g18 6f3 7d2 8s2 8p2 1/2[13]
146	Uqh	Unquadhexium	f-block	[Og] 5g18 6f4 7d2 8s2 8p2 1/2[13]
147	Uqs	Unquadseptium	f-block	[Og] 5g18 6f5 7d2 8s2 8p2 1/2[13]
148	Uqo	Unquadoctium	f-block	[Og] 5g18 6f6 7d2 8s2 8p2 1/2[13]
149	Uqe	Unquadennium	f-block	[Og] 5g18 6f6 7d3 8s2 8p2 1/2[13]
150	Upn	Unpentnilium	f-block	[Og] 5g18 6f6 7d4 8s2 8p2 1/2 [Og] 5g18 6f7 7d3 8s2 8p2 1/2[13]
151	Upu	Unpentunium	f-block	[Og] 5g18 6f8 7d3 8s2 8p2 1/2[13]
152	Upb	Unpentbium	f-block	[Og] 5g18 6f9 7d3 8s2 8p2 1/2[13]
153	Upt	Unpenttrium	f-block	[Og] 5g18 6f10 7d3 8s2 8p2 1/2 [Og] 5g18 6f11 7d2 8s2 8p2 1/2[13]
154	Upq	Unpentquadium	f-block	[Og] 5g18 6f11 7d3 8s2 8p2 1/2 [Og] 5g18 6f12 7d2 8s2 8p2 1/2[13]
155	Upp	Unpentpentium	f-block	[Og] 5g18 6f12 7d3 8s2 8p2 1/2 [Og] 5g18 6f13 7d2 8s2 8p2 1/2[13]
156	Uph	Unpenthexium	f-block	[Og] 5g18 6f13 7d3 8s2 8p2 1/2 [Og] 5g18 6f14 7d2 8s2 8p2 1/2[13]
157	Ups	Unpentseptium	d-block	[Og] 5g18 6f14 7d3 8s2 8p2 1/2[13]
158	Upo	Unpentoctium	d-block	[Og] 5g18 6f14 7d4 8s2 8p2 1/2[13]
159	Upe	Unpentennium	d-block	[Og] 5g18 6f14 7d5 8s2 8p2 1/2 [Og] 5g18 6f14 7d4 8s2 8p2 1/2 9s1[13]
160	Uhn	Unhexnilium	d-block	[Og] 5g18 6f14 7d6 8s2 8p2 1/2 [Og] 5g18 6f14 7d5 8s2 8p2 1/2 9s1[13]
161	Uhu	Unhexunium	d-block	[Og] 5g18 6f14 7d7 8s2 8p2 1/2 [Og] 5g18 6f14 7d6 8s2 8p2 1/2 9s1[13]
162	Uhb	Unhexbium	d-block	[Og] 5g18 6f14 7d8 8s2 8p2 1/2 [Og] 5g18 6f14 7d7 8s2 8p2 1/2 9s1[13]
163	Uht	Unhextrium	d-block	[Og] 5g18 6f14 7d9 8s2 8p2 1/2 [Og] 5g18 6f14 7d8 8s2 8p2 1/2 9s1[13]
164	Uhq	Unhexquadium	d-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2[13]
165	Uhp	Unhexpentium	d-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2 9s1[13]
166	Uhh	Unhexhexium	d-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2 9s2[13]
167	Uhs	Unhexseptium	p-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2 9s2 9p1 1/2 [Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p1 3/2 9s2[13]
168	Uho	Unhexoctium	p-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2 9s2 9p2 1/2 [Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p2 3/2 9s2[13]
169	Uhe	Unhexennium	p-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p1 3/2 9s2 9p2 1/2 [Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p3 3/2 9s2[13]
170	Usn	Unseptnilium	p-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p2 3/2 9s2 9p2 1/2 [Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p4 3/2 9s2[13]
171	Usu	Unseptunium	p-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p3 3/2 9s2 9p2 1/2 [Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p4 3/2 9s2 9p1 1/2[13]
172	Usb	Unseptbium	p-block	[Og] 5g18 6f14 7d10 8s2 8p2 1/2 8p4 3/2 9s2 9p2 1/2[13]
173	Ust	Unsepttrium	?	[172] 6g1 [172] 9p1 3/2
...	...	...	...	...
184	Uoq	Unoctquadium	?	[172] 6g5 7f4 8d3

• 人造元素
• 扩展元素周期表
• IUPAC元素系統命名法