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This is a typical display of the periodic table of the elements and contains the symbol and atomic number of each element. The periodic table of the chemical elements is a tabular method of displaying the chemical elements. Although precursors to this table exist, its invention is generally credited to Russian 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.^[1]

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 27 January 2008 (while element 118 has been synthesized, element 117 has not).

Contents 1 Table 2 See also 3 References 4 External links

[edit] Table

Group #	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Period
1	1 H																	2 He
2	3 Li	4 Be											5 B	6 C	7 N	8 O	9 F	10 Ne
3	11 Na	12 Mg											13 Al	14 Si	15 P	16 S	17 Cl	18 Ar
4	19 K	20 Ca	21 Sc	22 Ti	23 V	24 Cr	25 Mn	26 Fe	27 Co	28 Ni	29 Cu	30 Zn	31 Ga	32 Ge	33 As	34 Se	35 Br	36 Kr
5	37 Rb	38 Sr	39 Y	40 Zr	41 Nb	42 Mo	43 Tc	44 Ru	45 Rh	46 Pd	47 Ag	48 Cd	49 In	50 Sn	51 Sb	52 Te	53 I	54 Xe
6	55 Cs	56 Ba	*	72 Hf	73 Ta	74 W	75 Re	76 Os	77 Ir	78 Pt	79 Au	80 Hg	81 Tl	82 Pb	83 Bi	84 Po	85 At	86 Rn
7	87 Fr	88 Ra	**	104 Rf	105 Db	106 Sg	107 Bh	108 Hs	109 Mt	110 Ds	111 Rg	112 Uub	113 Uut	114 Uuq	115 Uup	116 Uuh	(117) (Uus)	118 Uuo
* Lanthanides			57 La	58 Ce	59 Pr	60 Nd	61 Pm	62 Sm	63 Eu	64 Gd	65 Tb	66 Dy	67 Ho	68 Er	69 Tm	70 Yb	71 Lu
** Actinides			89 Ac	90 Th	91 Pa	92 U	93 Np	94 Pu	95 Am	96 Cm	97 Bk	98 Cf	99 Es	100 Fm	101 Md	102 No	103 Lr

This common arrangement of the periodic table separates the lanthanides and actinides from other elements. The wide periodic table incorporates the f-block. The extended periodic table adds the 8th and 9th periods, incorporating the f-block and adding the theoretical g-block.

Element categories in the periodic table Metals Metalloids Nonmetals Unknown Alkali metals Alkaline earth metals Inner transition elements Transition elements Other metals Other nonmetals Halogens Noble gases Lanthanides Actinides
Atomic number colors show state at standard temperature and pressure (0 °C and 1 atm) Solids Liquids Gases Unknown	Borders show natural occurrence Primordial From decay Synthetic Undiscovered

[edit] See also

• Periodic table
• Periodic table (block)
• Periodic table (wide)
• Periodic table (extended)
• Table of nuclides

[edit] References

1. ^ "The periodic table of the elements". International Union of Pure and Applied Chemistry. 2007-07-22. http://www.iupac.org/didac/Didac%20Eng/Didac01/Content/S01.htm. Retrieved on 2008-02-08. 

[edit] External links

• WebElements.com
• NIST's X-Ray Mass Attenuation Coefficients of Elements
• Printable Periodic Tables, including blank, symbol only, symbol and mass, transparency version, and full information version
• Los Alamos version (for American school children, but contains more of the history)
• Online Dynamic Periodic table - Good notes behind each element.
• periodictable.com

v • d • e Periodic tables Layouts Standard · Vertical · Full names · Names and atomic weights · Text for last · Large table · Metals and nonmetals · Blocks · Valences · Inline f-block · 210 elements · Electron configurations · Atomic weights · Electronegativities · Alternatives · Crystal structure Lists of elements by Name · Atomic symbol · Atomic number · Atomic weight · Name etymology (after places, after people) · Discovery Boiling point · Melting point · Density · Oxidation state · Abundance (in humans) · Nuclear stability · Hardness Groups 1 (Alkali metals) · 2 (Alkaline earth metals) · 3 · 4 · 5 · 6 · 7 · 8 · 9 · 10 · 11 · 12 · 13 (Boron group) · 14 (Carbon group) · 15 (Pnictogens) · 16 (Chalcogens) · 17 (Halogens) · 18 (Noble gases) Periods 1 · 2 · 3 · 4 · 5 · 6 · 7 · 8 Other element categories Metals · Transition metals · Metalloids · Nonmetals · Lanthanoids · Actinoids · Rare earth elements · Platinum group metals (PGMs) · Post-transition metals Blocks s-block · p-block · d-block · f-block · g-block