In chemistry, the common graphical representation of the relationships between the elements. Elements (such as hydrogen or oxygen) are the substances by which different sorts of atoms are identified; they form compounds (hydrogen and oxygen combine to form water, the compound H2O). Images of the periodic table can be found at www.chemicalelements.com and www.webelements.com

Navigating the Periodic Table
From the second row on, the first element is of the group known as Alkali Metals.
The second element in each row is of the group known as Alkaline Earth Metals.
The last element in each row is of the group known as Noble Gases.
Elements in other positions are variously categorized as Non-metals, Transition Metals, Metalloids, or Halogens.
The sixth row, third column, includes the Lanthanide Series of 15 elements.
The seventh row, third column, includes the Actinide Series of elements.
Lanthanides and Actinides are categorized as Rare Earths.

The naming of the elements

Traditionally the discoverer named the element, and they named it after place, mythology, some property of it, or whatever took their fancy. Since 1947 the world body called IUPAC, the International Union of Pure and Applied Chemistry, has been the arbiter of names. Discoverers now have the right to submit a name for approval, but it is IUPAC who decide.1

In 1949 they adjudicated on several rival names. So beryllium was chosen in preference to glucinum or glucinium, and niobium in preference to columbium. They adopted the spellings lutetium and promethium instead of lutecium and prometheum.

They also chose wolfram over tungsten. However, this did not last, and official usage has varied. In their official list wolfram is now treated as an acceptable variant, listing the element as tungsten (wolfram).

In 1990 they finally tackled the more contentious spellings, and declared that aluminium, caesium, and sulfur were the official names. But in the first two cases the alternative is still valid: they list them as aluminium, aluminum and caesium, cesium. However, they do not list sulphur, I don't know why.

Most of the element names are much the same in all languages, but ancient ones like gold and tin are obviously quite different in each language. So for uniformity these ancient elements are also officially known by their classical names. They are listed as:

    gold (aurum)
    silver (argentum)
    copper (cuprum)
    tin (stannum)
    lead (plumbum)
    mercury (hydrargyrum)
    antimony (stibium)
    potassium (kalium)
    sodium (natrium)
The last three were added in the 1990 review, and the last two aren't genuinely classical, but were coined back around 1800. These (and wolfram/tungsten) explain all the cases where the symbol doesn't fit the name.

Note that there is no general push to rename the -um elements as -ium, although all future elements will end in -ium. Molybdenum, platinum, and tantalum are safe. Aluminium was originally named alumium in 1807, then quickly became aluminum and finally aluminium, which was the form used by the American Chemical Society until 1924.

The new transuranic elements went smoothly up to element 103. In fact the IUPAC rejected the Swedish claim to have discovered nobelium, but accepted their name for it anyway. Then in the 1960s the heavier elements were so fleeting that claims of discovery were dubious, and for several decades the IUPAC declined to adjudicate. So rival names sprang up.

The Soviets were first to claim discovery of elements 104 and then 105, which they called

    104   kurchatovium   Ku
    105   nielsbohrium   Ns
Later the Americans claimed to have discovered them, and called them
    104   rutherfordium  Rf
    105   hahnium        Ha
There was a lull, and once more discoveries were reported, they weren't given names. They were referred to simply as Element 104, Element 106 and so on. After a while the IUPAC devised a system of temporary names in 1990. New elements were to be designated using the syllables un, bi, tri, quad, pent, hex, sept, oct, enn, nil. By mixing Greek and Latin they got unique initials, which could be used to give the symbol. So Element 104 became unnilquadium, symbol Unq. (A double -ii- would be dropped, so 112 would be ununbium, not ununbiium.) These are only provisional names, and don't affect the right of the discoverer to propose a final name.

Eventually they got around to assigning permanent names.2 They recognized the American claim to having discovered

    106   seaborgium     Sg
and the German claims to
    107   nielsbohrium   Ns
    108   hassium        Hs
    109   meitnerium     Mt
but objected to the name seaborgium because Glenn Seaborg was still alive and to nielsbohrium because there was no precedent for combining first and last names. They also chose different names where there were existing rival claims. So in 1994 the IUPAC chose these names:
    104   dubnium        Db
    105   joliotium      Jl
    106   rutherfordium  Rf
    107   bohrium        Bh
    108   hahnium        Hn
    109   meitnerium     Mt
But there was much complaint and horse-trading about this, so they changed their minds, and in 1997 decided on these names, which are now universally accepted:
    104   rutherfordium  Rf
    105   dubnium        Db
    106   seaborgium     Sg
    107   bohrium        Bh
    108   hassium        Hs
    109   meitnerium     Mt
Two more German discoveries were recognized in 2003 and 2004 respectively (that of roentgenium is so far only an accepted recommendation, not a confirmed decision):
    110   darmstadtium   Ds
    111   roentgenium    Rg
A perhaps unfortunate consequence of the IUPAC's decision is that the rejected names cannot be reused for subsequent elements, so Kurchatov, Hahn, and Joliot miss out on this particular immortality. For this reason the IUPAC ask claimant discoverers not to use the laboratory's own choice of names in the literature, but to stick with systematic provisional names like ununoctium or Element 108 until the right of naming is established.

1. www.iupac.org/publications/pac/2002/pdf/7405x0787.pdf
2. www.iupac.org/reports/1997/6912transfermium/index.html

The following is stolen in part from the entry Periodic Table of the Elements and has been adjusted to make all entries that are above items of three digits aligned evenly and includes a list of elements in alphabetical and symbolic orders:

  

  1                                                                    2
  H                                                                   He
  3  4                                             5   6   7   8   9  10
 Li Be                                             B   C   N   O   F  Ne
 11 12                                            13  14  15  16  17  18
 Na Mg                                            Al  Si   P   S  Cl  Ar
 19 20    21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36
  K Ca    Sc  Ti   V  Cr  Mn  Fe  Co  Ni  Cu  Zn  Ga  Ge  As  Se  Br  Kr
 37 38    39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54
 Rb Sr     Y  Zr  Nb  Mo  Tc  Ru  Rh  Pd  Ag  Cd  In  Sn  Sb  Te   I  Xe
 55 56 *  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86
 Cs Ba    Lu  Hf  Ta   W  Re  Os  Ir  Pt  Au  Hg  Tl  Pb  Bi  Po  At  Rn
 87 88 % 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
 Fr Ra    Lr  Rf  Db  Sg  Bh  Hs  Mt  Ds Uuu Uub Uut Uuq Uup Uuh Uus Uuo

* Lanthanide  57  58  59  60  61  62  63  64  65  66  67  68  69  70
  Series:     La  Ce  Pr  Nd  Pm  Sm  Eu  Gd  Tb  Dy  Ho  Er  Tm  Yb
% Actinide    89  90  91  92  93  94  95  96  97  98  99 100 101 102
  Series:     Ac  Th  Pa   U  Np  Pu  Am  Cm  Bk  Cf  Es  Fm  Md  No

Listing in Alphabetical Order: Ac-actinium Al-aluminum Am-americium Sb-antimony Ar-argon As-arsenic At-astatine Ba-barium Bk-berkelium Be-beryllium Bi-bismuth Bh-bohrium B-boron Br-bromine Cd-cadmium Ca-calcium Cf-californium C-carbon Ce-cerium Cs-cesium Cl-chlorine Cr-chromium Co-cobalt Cu-copper Cm-curium Db-dubnium (1)Ds-darmstadtium Dy-dysprosium Es-einsteinium Er-erbium Eu-europium Fm-fermium F-fluorine Fr-francium Gd-gadolinium Ga-gallium Ge-germanium Au-gold Hf-hafnium Hs-hassium He-helium Ho-holmium H-hydrogen In-indium I-iodine Ir-iridium Fe-iron Kr-krypton La-lanthanum Lr-lawrencium Pb-lead Li-lithium Lu-lutetium Mg-magnesium Mn-manganese Mt-meitnerium Md-mendelevium Hg-mercury Mo-molybdenum Nd-neodymium Ne-neon Np-neptunium Ni-nickel Nb-niobium N-nitrogen No-nobelium Os-osmium O-oxygen Pd-palladium P-phosphorus Pt-platinum Pu-plutonium Po-polonium K-potassium Pr-praseodymium Pm-promethium Pa-protactinium Ra-radium Rn-radon Re-rhenium Rh-rhodium Rb-rubidium Ru-ruthenium Rf-rutherfordium Sm-samarium Sc-scandium Sg-seaborgium Se-selenium Si-silicon Ag-silver Na-sodium Sr-strontium S-sulfur Ta-tantalum Tc-technetium Te-tellurium Tb-terbium Tl-thallium Th-thorium Tm-thulium Sn-tin Ti-titanium W-tungsten ub-ununbium Uuh-ununhexium Uuo-ununoctium Uup-ununpentium Uuq-ununquadium Uus-ununseptium Uut-ununtrium Uuu-unununium U-uranium V-vanadium Xe-xenon Yb-ytterbium Y-yttrium Zn-zinc Zr-zirconium
Listing in Symbol Order: Ac-actinium Ag-silver Al-aluminum Am-americium Ar-argon As-arsenic At-astatine Au-gold B-boron Ba-barium Be-beryllium Bh-bohrium Bi-bismuth Bk-berkelium Br-bromine C-carbon Ca-calcium Cd-cadmium Ce-cerium Cf-californium Cl-chlorine Cm-curium Co-cobalt Cr-chromium Cs-cesium Cu-copper Db-dubnium (1)Ds-darmstadtium Dy-dysprosium Er-erbium Es-einsteinium Eu-europium F-fluorine Fe-iron Fm-fermium Fr-francium Ga-gallium Gd-gadolinium Ge-germanium H-hydrogen He-helium Hf-hafnium Hg-mercury Ho-holmium Hs-hassium I-iodine In-indium Ir-iridium K-potassium Kr-krypton La-lanthanum Li-lithium Lr-lawrencium Lu-lutetium Md-mendelevium Mg-magnesium Mn-manganese Mo-molybdenum Mt-meitnerium N-nitrogen Na-sodium Nb-niobium Nd-neodymium Ne-neon Ni-nickel No-nobelium Np-neptunium O-oxygen Os-osmium P-phosphorus Pa-protactinium Pb-lead Pd-palladium Pm-promethium Po-polonium Pr-praseodymium Pt-platinum Pu-plutonium Ra-radium Rb-rubidium Re-rhenium Rf-rutherfordium Rh-rhodium Rn-radon Ru-ruthenium S-sulfur Sb-antimony Sc-scandium Se-selenium Sg-seaborgium Si-silicon Sm-samarium Sn-tin Sr-strontium Ta-tantalum Tb-terbium Tc-technetium Te-tellurium Th-thorium Ti-titanium Tl-thallium Tm-thulium U-uranium Uub-ununbium Uuh-ununhexium Uuo-ununoctium Uup-ununpentium Uuq-ununquadium Uus-ununseptium Uut-ununtrium Uuu-unununium V-vanadium W-tungsten Xe-xenon Y-yttrium Yb-ytterbium Zn-zinc Zr-zirconium
(1) Note: The item listed as Ds-darmstadtium was previously known as Uun-ununnilium.

Variations on The Periodic Table of the Elements (science trivia)

A Periodic Table of the Elements indicates relationships between different atomic elements' properties and natures. A chemical element is one or more atoms of the same type. The tables all begin with hydrogen (H), the simplest and most common element in the universe.

Aside from hydrogen, all other atoms have increasing numbers of subatomic particles. Helium is the second element, followed by over 100 other atomic elements having a diversity of chemical and physical properties.

Most people have seen a rectangular periodic table of elements. There are dozens of other formats, some of which are circular.

A database of various styles of periodic tables is located here.

The http://www.chemicalgalaxy.co.uk/ is one example. (That is a large pic; it might load slowly).

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