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118
11HHidrogen2
13141516172HeHeliu
23LiLitiu4BeBeriliu5BBor6CCarbon7NAzot8OOxigen9FFluor10NeNeon
311NaSodiu12MgMagneziu345678910111213AlAluminiu14SiSiliciu15PFosfor16SSulf17ClClor18ArArgon
419KPotasiu20CaCalciu21ScScandiu22TiTitan23VVanadiu24CrCrom25MnMangan26FeFier27CoCobalt28NiNichel29CuCupru30ZnZinc31GaGaliu32GeGermaniu33AsArsen34SeSeleniu35BrBrom36KrKripton
537RbRubidiu38SrStronţiu39YYtriu40ZrZirconiu41NbNiobiu42MoMolibden43TcTehneţiu44RuRuteniu45RhRodiu46PdPaladiu47AgArgint48CdCadmiu49InIndiu50SnStaniu51SbStibiu52TeTelur53IIod54XeXenon
655CsCesiu56BaBariu57-71
La-Lu		72HfHafniu73TaTantal74WWolfram75ReReniu76OsOsmiu77IrIridiu78PtPlatină79AuAur80HgMercur81TlTaliu82PbPlumb83BiBismut84PoPoloniu85AtAstatin86RnRadon
787FrFranciu88RaRadiu89-103
Ac-Lr		104RfRutherfordiu105DbDubniu106SgSeaborgiu107BhBohriu108HsHassiu109MtMeitneriu110DsDarmstadtiu111RgRoentgeniu112CnCoperniciu113NhNihoniu114FlFleroviu115McMoscoviu116LvLivermoriu117TsUnunseptiu118OgUnunoctiu
8119UueUnunennium120UbnUnbinilium121-126
Ubu-Ubh
57LaLantan58CeCeriu59PrPraseodim60NdNeodim61PmPromeţiu62SmSamariu63EuEuropiu64GdGadoliniu65TbTerbiu66DyDisprosiu67HoHolmiu68ErErbiu69TmTuliu70YbYterbiu71LuLuteţiu
89AcActiniu90ThToriu91PaProtactiniu92UUraniu93NpNeptuniu94PuPlutoniu95AmAmericiu96CmCuriu97BkBerkeliu98CfCaliforniu99EsEinsteiniu100FmFermiu101MdMendeleviu102NoNobeliu103LrLawrenciu
121UbuUnbiunium122UbbUnbibium123UbtUnbitrium124UbqUnbiquadium125UbpUnbipentium126UbhUnbihexium127UbsUnbiseptium

Indicatori

Turnesol

Culoarea de origine naturală, unul dintre primii și cei mai cunoscuți indicatori acid-bază (pH)

Acid
[H+] > [OH-] pH = 0
Neutru
[H+] = [OH-] pH = 7
Alcalin
[OH-] > [H+] pH = 14