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{{Sidebar periodic table|expanded=forms}} |
{{Sidebar periodic table|expanded=forms}} |
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An '''extended periodic table''' theorizes about [[chemical elements]] beyond those currently known and proven. The element with the highest [[atomic number]] known is [[oganesson]] (''Z'' |
An '''extended [[periodic table]]''' theorizes about [[chemical elements]] beyond those currently known and proven. The element with the highest [[atomic number]] known is [[oganesson]] (''Z'' = 118), which completes the seventh [[period (periodic table)|period]] (row) in the [[periodic table]]. All elements in the eighth period and beyond thus remain purely hypothetical. |
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Elements beyond 118 will be placed in additional periods when discovered, laid out (as with the existing periods) to illustrate periodically recurring trends in the properties of the elements. Any additional periods are expected to contain more elements than the seventh period, as they are calculated to have an additional so-called ''g-block'', containing at least 18 elements with partially filled g-[[atomic orbital|orbitals]] in each period. An ''eight-period table'' containing this block was suggested by [[Glenn T. Seaborg]] in 1969.<ref name=LBL>{{cite web|url=http://www.lbl.gov/LBL-PID/Nobelists/Seaborg/65th-anniv/29.html|title=An Early History of LBNL|first=Glenn T.|last=Seaborg|author-link=Glenn T. Seaborg|date=August 26, 1996|access-date=2011-02-25|archive-date=2010-11-15|archive-url=https://web.archive.org/web/20101115025829/http://www.lbl.gov/LBL-PID/Nobelists/Seaborg/65th-anniv/29.html|url-status=dead}}</ref><ref name=SHE78>{{cite journal | doi = 10.2307/3963006 | last1 = Frazier | first1 = K. | title = Superheavy Elements | journal = Science News | volume = 113 | issue = 15 | pages = 236–238 | year = 1978 | jstor = 3963006}}</ref> The first element of the g-block may have atomic number 121, and thus would have the [[Systematic element name|systematic name]] [[unbiunium]]. Despite many searches, no elements in this region have been [[Synthetic element|synthesized]] or discovered in nature.<ref>[[Unbibium|Element 122]] was claimed to exist naturally in April 2008, but this claim was widely believed to be erroneous. {{cite web|url=http://www.rsc.org/chemistryworld/News/2008/May/02050802.asp|title=Heaviest element claim criticised|publisher=Rsc.org|date=2008-05-02|access-date=2010-03-16}}</ref> |
Elements beyond 118 will be placed in additional periods when discovered, laid out (as with the existing periods) to illustrate periodically recurring trends in the properties of the elements. Any additional periods are expected to contain more elements than the seventh period, as they are calculated to have an additional so-called ''g-block'', containing at least 18 elements with partially filled g-[[atomic orbital|orbitals]] in each period. An ''eight-period table'' containing this block was suggested by [[Glenn T. Seaborg]] in 1969.<ref name=LBL>{{cite web|url=http://www.lbl.gov/LBL-PID/Nobelists/Seaborg/65th-anniv/29.html|title=An Early History of LBNL|first=Glenn T.|last=Seaborg|author-link=Glenn T. Seaborg|date=August 26, 1996|access-date=2011-02-25|archive-date=2010-11-15|archive-url=https://web.archive.org/web/20101115025829/http://www.lbl.gov/LBL-PID/Nobelists/Seaborg/65th-anniv/29.html|url-status=dead}}</ref><ref name=SHE78>{{cite journal | doi = 10.2307/3963006 | last1 = Frazier | first1 = K. | title = Superheavy Elements | journal = Science News | volume = 113 | issue = 15 | pages = 236–238 | year = 1978 | jstor = 3963006}}</ref> The first element of the g-block may have atomic number 121, and thus would have the [[Systematic element name|systematic name]] [[unbiunium]]. Despite many searches, no elements in this region have been [[Synthetic element|synthesized]] or discovered in nature.<ref>[[Unbibium|Element 122]] was claimed to exist naturally in April 2008, but this claim was widely believed to be erroneous. {{cite web|url=http://www.rsc.org/chemistryworld/News/2008/May/02050802.asp|title=Heaviest element claim criticised|publisher=Rsc.org|date=2008-05-02|access-date=2010-03-16}}</ref> |
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Latin: A a Á á À à  â Ä ä Ǎ ǎ Ă ă Ā ā à ã Å å Ą ą Æ æ Ǣ ǣ B b C c Ć ć Ċ ċ Ĉ ĉ Č č Ç ç D d Ď ď Đ đ Ḍ ḍ Ð ð E e É é È è Ė ė Ê ê Ë ë Ě ě Ĕ ĕ Ē ē Ẽ ẽ Ę ę Ẹ ẹ Ɛ ɛ Ǝ ǝ Ə ə F f G g Ġ ġ Ĝ ĝ Ğ ğ Ģ ģ H h Ĥ ĥ Ħ ħ Ḥ ḥ I i İ ı Í í Ì ì Î î Ï ï Ǐ ǐ Ĭ ĭ Ī ī Ĩ ĩ Į į Ị ị J j Ĵ ĵ K k Ķ ķ L l Ĺ ĺ Ŀ ŀ Ľ ľ Ļ ļ Ł ł Ḷ ḷ Ḹ ḹ M m Ṃ ṃ N n Ń ń Ň ň Ñ ñ Ņ ņ Ṇ ṇ Ŋ ŋ O o Ó ó Ò ò Ô ô Ö ö Ǒ ǒ Ŏ ŏ Ō ō Õ õ Ǫ ǫ Ọ ọ Ő ő Ø ø Œ œ Ɔ ɔ P p Q q R r Ŕ ŕ Ř ř Ŗ ŗ Ṛ ṛ Ṝ ṝ S s Ś ś Ŝ ŝ Š š Ş ş Ș ș Ṣ ṣ ß T t Ť ť Ţ ţ Ț ț Ṭ ṭ Þ þ U u Ú ú Ù ù Û û Ü ü Ǔ ǔ Ŭ ŭ Ū ū Ũ ũ Ů ů Ų ų Ụ ụ Ű ű Ǘ ǘ Ǜ ǜ Ǚ ǚ Ǖ ǖ V v W w Ŵ ŵ X x Y y Ý ý Ŷ ŷ Ÿ ÿ Ỹ ỹ Ȳ ȳ Z z Ź ź Ż ż Ž ž ß Ð ð Þ þ Ŋ ŋ Ə ə
Greek: Ά ά Έ έ Ή ή Ί ί Ό ό Ύ ύ Ώ ώ Α α Β β Γ γ Δ δ Ε ε Ζ ζ Η η Θ θ Ι ι Κ κ Λ λ Μ μ Ν ν Ξ ξ Ο ο Π π Ρ ρ Σ σ ς Τ τ Υ υ Φ φ Χ χ Ψ ψ Ω ω {{Polytonic|}}
Cyrillic: А а Б б В в Г г Ґ ґ Ѓ ѓ Д д Ђ ђ Е е Ё ё Є є Ж ж З з Ѕ ѕ И и І і Ї ї Й й Ј ј К к Ќ ќ Л л Љ љ М м Н н Њ њ О о П п Р р С с Т т Ћ ћ У у Ў ў Ф ф Х х Ц ц Ч ч Џ џ Ш ш Щ щ Ъ ъ Ы ы Ь ь Э э Ю ю Я я ́
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