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Periodic Table of Elements

Compare Elements
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
1HHydrogen 2HeHelium
2
3LiLithium 4BeBeryllium
Alkali metals
Alkaline earth metals
Lanthanides
Actinides
Transition metals
Poor metals
Metalloids
Nonmetals
Halogens
Noble gases
5BBoron 6CCarbon 7NNitrogen 8OOxygen 9FFluorine 10NeNeon
3
11NaSodium 12MgMagnesium 13AlAluminum 14SiSilicon 15PPhosphorus 16SSulfur 17ClChlorine 18ArArgon
4
19KPotassium 20CaCalcium 21ScScandium 22TiTitanium 23VVanadium 24CrChromium 25MnManganese 26FeIron 27CoCobalt 28NiNickel 29CuCopper 30ZnZinc 31GaGallium 32GeGermanium 33AsArsenic 34SeSelenium 35BrBromine 36KrKrypton
5
37RbRubidium 38SrStrontium 39YYttrium 40ZrZirconium 41NbNiobium 42MoMolybdenum 43TcTechnetium 44RuRuthenium 45RhRhodium 46PdPalladium 47AgSilver 48CdCadmium 49InIndium 50SnTin 51SbAntimony 52TeTellurium 53IIodine 54XeXenon
6
55CsCesium 56BaBarium
*
72HfHafnium 73TaTantalum 74WTungsten 75ReRhenium 76OsOsmium 77IrIridium 78PtPlatinum 79AuGold 80HgMercury 81TlThallium 82PbLead 83BiBismuth 84PoPolonium 85AtAstatine 86RnRadon
7
87FrFrancium 88RaRadium
**
104RfRutherfordium 105DbDubnium 106SgSeaborgium 107BhBohrium 108HsHassium 109MtMeitnerium 110DsDarmstadtium 111RgRoentgenium 112UubUnunbium 113UutUnuntrium 114UuqUnunquadium 115UupUnunpentium 116UuhUnunhexium 117UusUnunseptium 118UuoUnunoctium
* Lanthanides
57LaLanthanum 58CeCerium 59PrPraseodymium 60NdNeodymium 61PmPromethium 62SmSamarium 63EuEuropium 64GdGadolinium 65TbTerbium 66DyDysprosium 67HoHolmium 68ErErbium 69TmThulium 70YbYtterbium 71LuLutetium
** Actinides
89AcActinium 90ThThorium 91PaProtactinium 92UUranium 93NpNeptunium 94PtPlutonium 95AmAmericium 96CmCurium 97BkBerkelium 98CfCalifornium 99EsEinsteinium 100FmFermium 101MdMendelevium 102NoNobelium 103LrLawrencium

State at STP (0°C, 1 atm)

Gas
Liquid
Solid

Natural Occurrence

Undiscovered Synthetic From decay Primordial

About the Periodic Table

The layout of the periodic table demonstrates recurring ("periodic") chemical properties. Elements are listed in order of increasing atomic number (i.e. the number of protons in the atomic nucleus). Rows are arranged so that elements with similar properties fall into the same vertical columns ("groups").

According to quantum mechanical theories of electron configuration within atoms, each horizontal row ("period") in the table corresponded to the filling of a quantum shell of electrons. There are progressively longer periods further down the table, grouping the elements into s-, p-, d- and f-blocks to reflect their electron configuration.

Note: Lanthanides are also known as "rare earth elements". Alkali metals, alkaline earth metals, transition metals, actinides, lanthanides, and poor metals are collectively known as "metals".