Editing Extended periodic table (section)

====Elements 119 and 120====
{{main|Ununennium|Unbinilium}}
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:{| class="wikitable"
|+ Some predicted properties of elements 119 and 120<ref name="Fricke"/><ref name=Haire/>
! Property
! 119
! 120
|-
! [[Standard atomic weight]]
| [322]
| [325]
|-
! [[Periodic table group|Group]]
| [[alkali metal|1]]
| [[alkaline earth metal|2]]
|-
! Valence [[electron configuration]]
| 8s<sup>1</sup>
| 8s<sup>2</sup>
|-
! Stable [[oxidation state]]s
| '''1''', 3
| '''2''', 4
|-
! First [[ionization energy]]
| 463.1 [[kilojoule per mole|kJ/mol]]
| 563.3 kJ/mol
|-
! [[Metallic radius]]
| 260 pm
| 200 pm
|-
! [[Density]]
| 3 g/cm<sup>3</sup>
| 7 g/cm<sup>3</sup>
|-
! [[Melting point]]
| {{convert|0–30|C|F|sigfig=2}}
| {{convert|680|C|F|sigfig=2}}
|-sigfig=
! [[Boiling point]]
| {{convert|630|C|F|sigfig=2}}
| {{convert|1700|C|F|sigfig=2}}
|}
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The first two elements of period&nbsp;8 will be ununennium and unbinilium, elements 119 and 120. Their [[electron configuration]]s should have the 8s orbital being filled. This orbital is relativistically stabilized and contracted; thus, elements&nbsp;119 and 120 should be more like [[rubidium]] and [[strontium]] than their immediate neighbours above, [[francium]] and [[radium]]. Another effect of the relativistic contraction of the 8s orbital is that the [[atomic radius|atomic radii]] of these two elements should be about the same as those of francium and radium. They should behave like normal [[alkali metal|alkali]] and [[alkaline earth metal]]s (albeit less reactive than their immediate vertical neighbours), normally forming +1 and +2 [[oxidation state]]s, respectively, but the relativistic destabilization of the 7p<sub>3/2</sub> subshell and the relatively low [[ionization energy|ionization energies]] of the 7p<sub>3/2</sub> electrons should make higher oxidation states like +3 and +4 (respectively) possible as well.<ref name="Fricke"/><ref name=Haire>{{cite book| title=The Chemistry of the Actinide and Transactinide Elements| editor1-last=Morss|editor2-first=Norman M.| editor2-last=Edelstein| editor3-last=Fuger|editor3-first=Jean| last1=Hoffman|first1=Darleane C. |last2=Lee |first2=Diana M. |last3=Pershina |first3=Valeria |chapter=Transactinides and the future elements| publisher= [[Springer Science+Business Media]]| year=2006| isbn=978-1-4020-3555-5| location=Dordrecht, The Netherlands| edition=3rd| ref=CITEREFHaire2006}}</ref>