Extended periodic table

Scientists are trying to make new chemical elements that do not exist yet. In this way, they will extend the periodic table, or make it longer. As of 2026, the element with the highest atomic number is oganesson (Og), element 118. Scientists have tried to make atoms with higher atomic numbers, by forcing the nuclei of smaller atoms to merge into bigger ones, a process known as nuclear fusion. Scientists have also made predictions about how to make these atoms. There is probably a biggest possible atomic number for any atom. Atoms with a higher atomic number than this cannot exist. However, scientists are not sure what this number is.

## Layout

The **extended periodic table** is a version of the periodic table that is longer than the normal one, making room for future synthetic element<nowiki/>s. The inner transition metals are placed between Group 2 and Group 3 on the periodic table. On a normal periodic table, the inner transition metals are below Groups 2 and 3.

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|style="width:8%; color:#F00"|**5**|style="width:5%; background-color:#F69"|37 Rb|style="width:5%; background-color:#F69"|38 Sr|style="width:2%" colspan="36"||style="width:5%; background-color:#CF9"|39 Y|style="width:5%; background-color:#CF9"|40 Zr|style="width:5%; background-color:#CF9"|41 Nb|style="width:5%; background-color:#CF9"|42 Mo|style="width:5%; background-color:#CF9"|43 Tc|style="width:5%; background-color:#CF9"|44 Ru|style="width:5%; background-color:#CF9"|45 Rh|style="width:5%; background-color:#CF9"|46 Pd|style="width:5%; background-color:#CF9"|47 Ag|style="width:5%; background-color:#CF9"|48 Cd|style="width:5%; background-color:#9CF"|49 In|style="width:5%; background-color:#9CF"|50 Sn|style="width:5%; background-color:#9CF"|51 Sb|style="width:5%; background-color:#9CF"|52 Te|style="width:5%; background-color:#9CF"|53 I|style="width:5%; background-color:#9CF"|54 Xe|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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|style="width:8%; color:#F00"|**8**|style="width:5%; background-color:#FBD"|119 Uue|style="width:5%; background-color:#FBD"|120 Ubn|style="width:5%; background-color:#FDA"|121 Ubu|style="width:5%; background-color:#FDA"|122 Ubb|style="width:5%; background-color:#FDA"|123 Ubt|style="width:5%; background-color:#FDA"|124 Ubq|style="width:5%; background-color:#FDA"|125 Ubp|style="width:5%; background-color:#FDA"|126 Ubh|style="width:5%; background-color:#FDA"|127 Ubs|style="width:5%; background-color:#FDA"|128 Ubo|style="width:5%; background-color:#FDA"|129 Ube|style="width:5%; background-color:#FDA"|130 Utn|style="width:5%; background-color:#FDA"|131 Utu|style="width:5%; background-color:#FDA"|132 Utb|style="width:5%; background-color:#FDA"|133 Utt|style="width:5%; background-color:#FDA"|134 Utq|style="width:5%; background-color:#FDA"|135 Utp|style="width:5%; background-color:#FDA"|136 Uth|style="width:5%; background-color:#FDA"|137 Uts|style="width:5%; background-color:#FDA"|138 Uto|style="width:5%; background-color:#CEF"|139 Ute|style="width:5%; background-color:#CEF"|140 Uqn|style="width:5%; background-color:#CEF"|141 Uqu|style="width:5%; background-color:#CEF"|142 Uqb|style="width:5%; background-color:#BFE"|143 Uqt|style="width:5%; background-color:#BFE"|144 Uqq|style="width:5%; background-color:#BFE"|145 Uqp|style="width:5%; background-color:#BFE"|146 Uqh|style="width:5%; background-color:#BFE"|147 Uqs|style="width:5%; background-color:#BFE"|148 Uqo|style="width:5%; background-color:#BFE"|149 Uqe|style="width:5%; background-color:#BFE"|150 Upn|style="width:5%; background-color:#BFE"|151 Upu|style="width:5%; background-color:#BFE"|152 Upb|style="width:5%; background-color:#BFE"|153 Upt|style="width:5%; background-color:#BFE"|154 Upq|style="width:5%; background-color:#BFE"|155 Upp|style="width:5%; background-color:#BFE"|156 Uph|style="width:5%; background-color:#DFC"|157 Ups|style="width:5%; background-color:#DFC"|158 Upo|style="width:5%; background-color:#DFC"|159 Upe|style="width:5%; background-color:#DFC"|160 Uhn|style="width:5%; background-color:#DFC"|161 Uhu|style="width:5%; background-color:#DFC"|162 Uhb|style="width:5%; background-color:#DFC"|163 Uht|style="width:5%; background-color:#DFC"|164 Uhq|style="width:5%; background-color:#DFC"|165 Uhp|style="width:5%; background-color:#DFC"|166 Uhh|style="width:5%; background-color:#CEF"|167 Uhs|style="width:5%; background-color:#CEF"|168 Uho|style="width:5%; background-color:#CEF"|169 Uhe|style="width:5%; background-color:#CEF"|170 Usn|style="width:5%; background-color:#CEF"|171 Usu|style="width:5%; background-color:#CEF"|172 Usb|
|style="width:8%; color:#F00"|**9**|style="width:5%; background-color:#FBD"|173 Ust|style="width:5%; background-color:#FBD"|174 Usq|style="width:5%; background-color:#FBD"|175 Usp|style="width:5%; background-color:#FBD"|176 Ush|style="width:5%; background-color:#FBD"|177 Uss|style="width:5%; background-color:#FBD"|178 Uso|style="width:5%; background-color:#FBD"|179 Use|style="width:5%; background-color:#FBD"|180 Uon|style="width:5%; background-color:#FBD"|181 Uou|style="width:5%; background-color:#FBD"|182 Uob|style="width:5%; background-color:#FBD"|183 Uot|style="width:5%; background-color:#FBD"|184 Uoq|style="width:5%; background-color:#FBD"|185 Uop|style="width:5%; background-color:#FBD"|186 Uoh|style="width:5%; background-color:#FBD"|187 Uos|style="width:5%; background-color:#FBD"|188 Uoo|style="width:5%; background-color:#FBD"|189 Uoe|style="width:5%; background-color:#FBD"|190 Uen|style="width:5%; background-color:#FBD"|191 Ueu|style="width:5%; background-color:#FBD"|192 Ueb|style="width:5%; background-color:#FBD"|193 Uet|style="width:5%; background-color:#FBD"|194 Ueq|style="width:5%; background-color:#FBD"|195 Uep|style="width:5%; background-color:#FBD"|196 Ueh|style="width:5%; background-color:#FBD"|197 Ues|style="width:5%; background-color:#FBD"|198 Ueo|style="width:5%; background-color:#FBD"|199 Uee|style="width:5%; background-color:#FBD"|200 Bnn|style="width:5%; background-color:#FBD"|201 Bnu|style="width:5%; background-color:#FBD"|202 Bnb|style="width:5%; background-color:#FBD"|203 Bnt|style="width:5%; background-color:#FBD"|204 Bnq|style="width:5%; background-color:#FBD"|205 Bnp|style="width:5%; background-color:#FBD"|206 Bnh|style="width:5%; background-color:#FBD"|207 Bns|style="width:5%; background-color:#FBD"|208 Bno|style="width:5%; background-color:#FBD"|209 Bne|style="width:5%; background-color:#FBD"|210 Bun|style="width:5%; background-color:#FBD"|211 Buu|style="width:5%; background-color:#FBD"|212 Bub|style="width:5%; background-color:#FBD"|213 But|style="width:5%; background-color:#FBD"|214 Buq|style="width:5%; background-color:#FBD"|215 Bup|style="width:5%; background-color:#FBD"|216 Buh|style="width:5%; background-color:#FBD"|217 Bus|style="width:5%; background-color:#FBD"|218 Buo|style="width:5%; background-color:#FBD"|219 Bue|style="width:5%; background-color:#FBD"|220 Bbn|style="width:5%; background-color:#FBD"|221 Bbu|style="width:5%; background-color:#FBD"|222 Bbb|style="width:5%; background-color:#FBD"|223 Bbt|style="width:5%; background-color:#FBD"|224 Bbq|style="width:5%; background-color:#FBD"|225 Bbp|style="width:5%; background-color:#FBD"|226 Bbh|

## Naming of elements

Each of these predicted elements can be given a name. These names are based on the digits of the atomic number. They were set by IUPAC, and come from Latin and Greek.
- 0: nill (N)
- 1: un (U)
- 2: bi (B)
- 3: tri (T)
- 4: quad (Q)
- 5: pent (P)
- 6: hex (H)
- 7: sept (S)
- 8: oct (O)
- 9: en (E)
The chemical name and symbol come from these put together, followed by "ium" or "um". For example, element 138 is called _untrioctium_ and has symbol Uto.

An element can also be named by "eka-" followed by the element above it in the periodic table. For example, ununennium can also be called _eka-francium_.

## Predictions

Pekka Pykkö has predicted how atomic orbitals will fill up as atomic number increases. According to this model, element 172 should be the end of the row that starts with element 119.

## Related pages

- Chemical element
- Chemistry
- Island of stability

## Other websites

- Images of g-orbitals
- jeries.rihani.com Extended periodic table
- Eric Scerri, The Periodic Table, Its Story and Its Significance, Oxford University Press, 2007.