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This is a '''large version of the periodic table''' and contains the symbol, atomic number, and [[standard atomic weight]] of each element.  The [[Periodic table|periodic table of the chemical elements]] is a [[table (information)|tabular]] method of displaying the [[chemical element]]s. Although precursors to this table exist, its invention is generally credited to [[Russia]]n [[chemist]] [[Dmitri Mendeleev]] in 1869. Mendeleev intended the table to illustrate recurring ("periodic") trends in the properties of the elements. The layout of the table has been refined and extended over time, as new elements have been discovered, and new theoretical models have been developed to explain chemical behavior.<ref>{{cite news | author = | title = The periodic table of the elements | publisher = [[International Union of Pure and Applied Chemistry]] | date = [[2007-07-22]] | url = http://www.iupac.org/didac/Didac%20Eng/Didac01/Content/S01.htm| accessdate=2008-02-08}}</ref>

The periodic table is now ubiquitous within the academic discipline of [[chemistry]], providing an extremely useful framework to classify, systematize and compare all the many different forms of [[chemical]] behavior. The table has also found wide application in [[physics]], [[biology]], [[engineering]], and [[industry]]. The current standard table contains 117 confirmed elements as of [[January 27]], [[2008]] (while [[Ununoctium|element 118]] has been synthesized, [[ununseptium|element 117]] has not).

==Table==
<!-- key -->
{| border="0" cellpadding="2" cellspacing="2" style="width:100%; border: 1px solid black; text-align:center;"
|-
| colspan="2" style="border-bottom: 1px solid black" |
{{element color legend|width:100%;}}

|-
| width="50%" style="border-right: 1px solid black" |
{| width="100%" cellpadding="2"
|+ State at [[standard temperature and pressure]] (0°C and 1 atm)
|-
! width="33%" style="text-align: center; color: {{element color/Gas}};"    | Gases
! width="33%" style="text-align: center; color: {{element color/Liquid}};" | Liquids
! width="33%" style="text-align: center; color: {{element color/Solid}};"  | Solids
|}

|width="50%"|
{| width="100%" cellpadding="2" style="font-size: 0.83em"|
|+ Natural occurrence
|-
| width="25%" style="text-align: center; border: {{element frame/Undiscovered}};"  | Undiscovered
| width="25%" style="text-align: center; border: {{element frame/Synthetic}};"     | Synthetic
| width="25%" style="text-align: center; border: {{element frame/Natural radio}};" | From decay
| width="25%" style="text-align: center; border: {{element frame/Primordial}};"    | Primordial
|}

|}

{| border="0" cellpadding="5" cellspacing="2" style="width:80%;"
|-
! style="width:1.5%;" | [[Group (periodic table)|Group]]&nbsp;→
! style="width:3.5%;" | [[Alkali metal       |1]]
! style="width:3.5%;" | [[Alkaline earth metal|2]]
! style="width:3.5%;" | [[Group 3 element    |3]]
! style="width:3.5%;" | [[Group 4 element    |4]]
! style="width:3.5%;" | [[Group 5 element    |5]]
! style="width:3.5%;" | [[Group 6 element    |6]]
! style="width:3.5%;" | [[Group 7 element    |7]]
! style="width:3.5%;" | [[Group 8 element    |8]]
! style="width:3.5%;" | [[Group 9 element    |9]]
! style="width:3.5%;" | [[Group 10 element   |10]]
! style="width:3.5%;" | [[Group 11 element   |11]]
! style="width:3.5%;" | [[Group 12 element   |12]]
! style="width:3.5%;" | [[Boron group        |13]]
! style="width:3.5%;" | [[Carbon group       |14]]
! style="width:3.5%;" | [[Nitrogen group     |15]]
! style="width:3.5%;" | [[Chalcogen          |16]]
! style="width:3.5%;" | [[Halogen            |17]]
! style="width:3.5%;" | [[Noble gas          |18]]
|- align="center"
! ↓&nbsp;[[Periodic table period|Period]]
|| IA || IIA || IIIB || IVB || VB || VIB || VIIB || VIIIB || VIIIB || VIIIB || IB || IIB || IIIA || IVA || VA || VIA || VIIA || VIIIA
|- align="center"
! [[Period 1 element|1]]
| {{element cell-3 | 1|hydrogen  |H |1.00794(7)    |Gas  |Nonmetals|Primordial}}
| colspan="2" align="center" | <small>Name of element</small><br>[[Atomic number]]<br><big>[[Chemical symbol]]</big><br />
<small>[[Relative atomic mass]]&nbsp;†</small>
| colspan="14" | 
| {{element cell-3 | 2|helium    |He|4.002602(2)   |Gas  |Noble gases|Primordial}}
|- align="center"
! [[Period 2 element|2]]
| {{element cell-3 | 3|lithium   |Li|6.941(2)      |Solid|Alkali metals|Primordial}}
| {{element cell-3 | 4|beryllium |Be|9.012182(3)   |Solid|Alkaline earth metals|Primordial}}
| colspan="10" | 
| {{element cell-3 | 5|boron     |B |10.811(7)     |Solid|Metalloids|Primordial}}
| {{element cell-3 | 6|carbon    |C |12.0107(8)    |Solid|Nonmetals|Primordial}}
| {{element cell-3 | 7|nitrogen  |N |14.00674(7)   |Gas  |Nonmetals|Primordial}}
| {{element cell-3 | 8|oxygen    |O |15.9994(3)    |Gas  |Nonmetals|Primordial}}
| {{element cell-3 | 9|fluorine  |F |18.9984032(5) |Gas  |Halogens|Primordial}}
| {{element cell-3 |10|neon      |Ne|20.1797(6)    |Gas  |Noble gases|Primordial}}<includeonly>
|}</includeonly></onlyinclude>
|- align="center"
! [[Period 3 element|3]]
| {{element cell-3 |11|sodium    |Na|22.98976928(2)|Solid|Alkali metals|Primordial}}
| {{element cell-3 |12|magnesium |Mg|24.3050(6)    |Solid|Alkaline earth metals|Primordial}}
| colspan="10" | 
| {{element cell-3 |13|aluminium |Al|26.9815386(8) |Solid|Poor metals|Primordial}}
| {{element cell-3 |14|silicon   |Si|28.0855(3)    |Solid|Metalloids|Primordial}}
| {{element cell-3 |15|phosphorus|P |30.973762(2)  |Solid|Nonmetals|Primordial}}
| {{element cell-3 |16|sulfur    |S |32.066(6)     |Solid|Nonmetals|Primordial}}
| {{element cell-3 |17|chlorine  |Cl|35.4527(9)    |Gas  |Halogens|Primordial}}
| {{element cell-3 |18|argon     |Ar|39.948(1)     |Gas  |Noble gases|Primordial}}
|- align="center"
! [[Period 4 element|4]]
| {{element cell-3 |19|potassium |K |39.0983(1)    |Solid|Alkali metals|Primordial}}
| {{element cell-3 |20|calcium   |Ca|40.078(4)     |Solid|Alkaline earth metals|Primordial}}
| {{element cell-3 |21|scandium  |Sc|44.955912(6)  |Solid|Transition metals|Primordial}}
| {{element cell-3 |22|titanium  |Ti|47.867(1)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |23|vanadium  |V |50.9415(1)    |Solid|Transition metals|Primordial}}
| {{element cell-3 |24|chromium  |Cr|51.9961(6)    |Solid|Transition metals|Primordial}}
| {{element cell-3 |25|manganese |Mn|54.938045(5)  |Solid|Transition metals|Primordial}}
| {{element cell-3 |26|iron      |Fe|55.845(2)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |27|cobalt    |Co|58.933195(5)  |Solid|Transition metals|Primordial}}
| {{element cell-3 |28|nickel    |Ni|58.6934(2)    |Solid|Transition metals|Primordial}}
| {{element cell-3 |29|copper    |Cu|63.546(3)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |30|zinc      |Zn|65.39(2)      |Solid|Transition metals|Primordial}}
| {{element cell-3 |31|gallium   |Ga|69.723(1)     |Solid|Poor metals|Primordial}}
| {{element cell-3 |32|germanium |Ge|72.61(2)      |Solid|Metalloids|Primordial}}
| {{element cell-3 |33|arsenic   |As|74.92160(2)   |Solid|Metalloids|Primordial}}
| {{element cell-3 |34|selenium  |Se|78.96(3)      |Solid|Nonmetals|Primordial}}
| {{element cell-3 |35|bromine   |Br|79.904(1)     |Liquid|Halogens|Primordial}}
| {{element cell-3 |36|krypton   |Kr|83.80(1)      |Gas  |Noble gases|Primordial}}
|- align="center"
! [[Period 5 element|5]]
| {{element cell-3 |37|rubidium  |Rb|85.4678(3)    |Solid|Alkali metals|Primordial}}
| {{element cell-3 |38|strontium |Sr|87.62(1)      |Solid|Alkaline earth metals|Primordial}}
| {{element cell-3 |39|yttrium   |Y |88.90585(2)   |Solid|Transition metals|Primordial}}
| {{element cell-3 |40|zirconium |Zr|91.224(2)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |41|niobium   |Nb|92.90638(2)   |Solid|Transition metals|Primordial}}
| {{element cell-3 |42|molybdenum|Mo|95.94(1)      |Solid|Transition metals|Primordial}}
| {{element cell-3 |43|technetium|Tc|[97.9072]     |Solid|Transition metals|Natural radio}}
| {{element cell-3 |44|ruthenium |Ru|101.07(2)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |45|rhodium   |Rh|102.90550(2)  |Solid|Transition metals|Primordial}}
| {{element cell-3 |46|palladium |Pd|106.42(1)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |47|silver    |Ag|107.8682(2)   |Solid|Transition metals|Primordial}}
| {{element cell-3 |48|cadmium   |Cd|112.411(8)    |Solid|Transition metals|Primordial}}
| {{element cell-3 |49|indium    |In|114.818(3)    |Solid|Poor metals|Primordial}}
| {{element cell-3 |50|tin       |Sn|118.710(7)    |Solid|Poor metals|Primordial}}
| {{element cell-3 |51|antimony  |Sb|121.760(1)    |Solid|Metalloids|Primordial}}
| {{element cell-3 |52|tellurium |Te|127.60(3)     |Solid|Metalloids|Primordial}}
| {{element cell-3 |53|iodine    |I |126.90447(3)  |Solid|Halogens|Primordial}}
| {{element cell-3 |54|xenon     |Xe|131.29(2)     |Gas  |Noble gases|Primordial}}
|- align="center"
! [[Period 6 element|6]]
| {{element cell-3 |55|caesium   |Cs|132.9054519(2)|Solid|Alkali metals|Primordial}}
| {{element cell-3 |56|barium    |Ba|137.327(7)    |Solid|Alkaline earth metals|Primordial}}
| {{element cell-2   |57-71<br/>*  |Lanthanides|  |  |Solid|Lanthanides}}
| {{element cell-3 |72|hafnium   |Hf|178.49(2)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |73|tantalum  |Ta|180.94788(2)  |Solid|Transition metals|Primordial}}
| {{element cell-3 |74|tungsten  |W |183.84(1)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |75|rhenium   |Re|186.207(1)    |Solid|Transition metals|Primordial}}
| {{element cell-3 |76|osmium    |Os|190.23(3)     |Solid|Transition metals|Primordial}}
| {{element cell-3 |77|iridium   |Ir|192.217(3)    |Solid|Transition metals|Primordial}}
| {{element cell-3 |78|platinum  |Pt|195.084(9)    |Solid|Transition metals|Primordial}}
| {{element cell-3 |79|gold      |Au|196.966569(4) |Solid|Transition metals|Primordial}}
| {{element cell-3 |80|mercury   |Hg|200.59(2)     |Liquid|Transition metals|Primordial|mercury (element)}}
| {{element cell-3 |81|thallium  |Tl|204.3833(2)   |Solid|Poor metals|Primordial}}
| {{element cell-3 |82|lead      |Pb|207.2(1)      |Solid|Poor metals|Primordial}}
| {{element cell-3 |83|bismuth   |Bi|208.98040(1)  |Solid|Poor metals|Primordial}}
| {{element cell-3 |84|polonium  |Po|[208.9824]    |Solid|Metalloids|Natural radio}}
| {{element cell-3 |85|astatine  |At|[209.9871]    |Solid|Halogens|Natural radio}}
| {{element cell-3 |86|radon     |Rn|[222.0176]    |Gas  |Noble gases|Natural radio}}
|- align="center"
! [[Period 7 element|7]]
| {{element cell-3 |87|francium     |Fr|[223.0197] |Solid|Alkali metals|Natural radio}}
| {{element cell-3 |88|radium       |Ra|[226.0254] |Solid|Alkaline earth metals|Natural radio}}
| {{element cell-2   |89-103<br/>**   |Actinides| |  |Solid|Actinides}}
| {{element cell-3|104|rutherfordium|Rf|[263.1125] |Solid|Transition metals|Synthetic}}
| {{element cell-3|105|dubnium      |Db|[262.1144] |Solid|Transition metals|Synthetic}}
| {{element cell-3|106|seaborgium   |Sg|[266.1219] |Solid|Transition metals|Synthetic}}
| {{element cell-3|107|bohrium      |Bh|[264.1247] |Solid|Transition metals|Synthetic}}
| {{element cell-3|108|hassium      |Hs|[269.1341] |Solid|Transition metals|Synthetic}}
| {{element cell-3|109|meitnerium   |Mt|[268.1388] |Solid|Transition metals|Synthetic}}
| {{element cell-3|110|darmstadtium |Ds|[272.1463] |Solid|Transition metals|Synthetic}}
| {{element cell-3|111|roentgenium  |Rg|[272.1535] |Solid|Transition metals|Synthetic}}
| {{element cell-3|112|ununbium     |Uub|[277]     |Liquid|Transition metals|Synthetic}}
| {{element cell-3|113|ununtrium    |Uut|[284]     |Solid|Poor metals|Synthetic}}
| {{element cell-3|114|ununquadium  |Uuq|[289]     |Solid|Poor metals|Synthetic}}
| {{element cell-3|115|ununpentium  |Uup|[288]     |Solid|Poor metals|Synthetic}}
| {{element cell-3|116|ununhexium   |Uuh|[292]     |Solid|Poor metals|Synthetic}}
| {{element cell-3|117|ununseptium  |Uus|[292]‡    |Solid|Halogens|Undiscovered}}
| {{element cell-3|118|ununoctium   |Uuo|[294]     |Gas  |Noble gases|Synthetic}}
|-
| colspan="21" | <br>
|-
| align="right" colspan="3" | <big>*&nbsp;'''[[Lanthanide]]s''' &nbsp;</big>
| {{element cell-3 |57|lanthanum   |La|138.90547(7)|Solid|Lanthanides|Primordial}}
| {{element cell-3 |58|cerium      |Ce|140.116(1)  |Solid|Lanthanides|Primordial}}
| {{element cell-3 |59|praseodymium|Pr|140.90765(2)|Solid|Lanthanides|Primordial}}
| {{element cell-3 |60|neodymium   |Nd|144.242(3)  |Solid|Lanthanides|Primordial}}
| {{element cell-3 |61|promethium  |Pm|[144.9127]  |Solid|Lanthanides|Natural radio}}
| {{element cell-3 |62|samarium    |Sm|150.36(2)   |Solid|Lanthanides|Primordial}}
| {{element cell-3 |63|europium    |Eu|151.964(1)  |Solid|Lanthanides|Primordial}}
| {{element cell-3 |64|gadolinium  |Gd|157.25(3)   |Solid|Lanthanides|Primordial}}
| {{element cell-3 |65|terbium     |Tb|158.92535(2)|Solid|Lanthanides|Primordial}}
| {{element cell-3 |66|dysprosium  |Dy|162.500(1)  |Solid|Lanthanides|Primordial}}
| {{element cell-3 |67|holmium     |Ho|164.93032(2)|Solid|Lanthanides|Primordial}}
| {{element cell-3 |68|erbium      |Er|167.259(3)  |Solid|Lanthanides|Primordial}}
| {{element cell-3 |69|thulium     |Tm|168.93421(2)|Solid|Lanthanides|Primordial}}
| {{element cell-3 |70|ytterbium   |Yb|173.04(3)   |Solid|Lanthanides|Primordial}}
| {{element cell-3 |71|lutetium    |Lu|174.967(1)  |Solid|Lanthanides|Primordial}}
|-
| align="right" colspan="3" | <big>**&nbsp;'''[[Actinide]]s''' &nbsp;</big>
| {{element cell-3 |89|actinium    |Ac|[227.0277]  |Solid|Actinides|Natural radio}}
| {{element cell-3 |90|thorium     |Th|232.03806(2)|Solid|Actinides|Primordial}}
| {{element cell-3 |91|protactinium|Pa|231.03588(2)|Solid|Actinides|Natural radio}}
| {{element cell-3 |92|uranium     |U |238.02891(3)|Solid|Actinides|Primordial}}
| {{element cell-3 |93|neptunium   |Np|[237.0482]  |Solid|Actinides|Natural radio}}
| {{element cell-3 |94|plutonium   |Pu|[244.0642]  |Solid|Actinides|Primordial}}
| {{element cell-3 |95|americium   |Am|[243.0614]  |Solid|Actinides|Synthetic}}
| {{element cell-3 |96|curium      |Cm|[247.0703]  |Solid|Actinides|Synthetic}}
| {{element cell-3 |97|berkelium   |Bk|[247.0703]  |Solid|Actinides|Synthetic}}
| {{element cell-3 |98|californium |Cf|[251.0796]  |Solid|Actinides|Synthetic}}
| {{element cell-3 |99|einsteinium |Es|[252.0830]  |Solid|Actinides|Synthetic}}
| {{element cell-3|100|fermium     |Fm|[257.0951]  |Solid|Actinides|Synthetic}}
| {{element cell-3|101|mendelevium |Md|[258.0984]  |Solid|Actinides|Synthetic}}
| {{element cell-3|102|nobelium    |No|[259.1011]  |Solid|Actinides|Synthetic}}
| {{element cell-3|103|lawrencium  |Lr|[262.110]   |Solid|Actinides|Synthetic}}
|}

<small>†&nbsp;A value in brackets, such as [259.1011], is the [[atomic mass]] of the most stable [[isotope]] unless it is an integer, in which case it is the [[mass number]] of the most stable isotope. In all other cases, the value is the [[relative atomic mass]] of common terrestrial composition, according to Atomic Weights of the Elements 2001, and includes its uncertainty in [[parenthesis]]. For example, the value of 1.00794(7) for hydrogen means that a normal terrestrial isotopic composition of hydrogen has a [[relative atomic mass]] of 1.00794 [[atomic mass unit]]s (u) with an uncertainty of 0.00007u, reflecting primarily local variability around the earth. <br>
‡&nbsp;This atomic mass is only an estimate, as this element has not yet been discovered.</small>

==References==
{{refbegin}}
*[http://www.iupac.org/reports/periodic_table/ IUPAC periodic table] (Retrieved [[20 June]], [[2005]])
*[http://www.webelements.com/ WebElements Periodic table (professional edition)] (Retrieved [[20 June]], [[2005]])
* ''Atomic Weights of the Elements 2001'', [http://www.iupac.org/publications/pac/2003/7508/7508x1107.html Pure Appl. Chem. 75(8), 1107-1122, 2003]
*[http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html IUPAC Standard Atomic Weights Revised] (2005).
{{refend}}
=== Notes ===
{{reflist|2}}

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