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118
11HHydrogen2
13141516172HeHelium
23LiLithium4BeBeryllium5BBoron6CCarbon7NNitrogen8OOxygen9FFluorine10NeNeon
311NaSodium12MgMagnesium345678910111213AlAluminum14SiSilicon15PPhosphorus16SSulfur17ClChlorine18ArArgon
419KPotassium20CaCalcium21ScScandium22TiTitanium23VVanadium24CrChromium25MnManganese26FeIron27CoCobalt28NiNickel29CuCopper30ZnZinc31GaGallium32GeGermanium33AsArsenic34SeSelenium35BrBromine36KrKrypton
537RbRubidium38SrStrontium39YYttrium40ZrZirconium41NbNiobium42MoMolybdenum43TcTechnetium44RuRuthenium45RhRhodium46PdPalladium47AgSilver48CdCadmium49InIndium50SnTin51SbAntimony52TeTellurium53IIodine54XeXenon
655CsCaesium56BaBarium57-71
La-Lu		72HfHafnium73TaTantalum74WTungsten75ReRhenium76OsOsmium77IrIridium78PtPlatinum79AuGold80HgMercury81TlThallium82PbLead83BiBismuth84PoPolonium85AtAstatine86RnRadon
787FrFrancium88RaRadium89-103
Ac-Lr		104RfRutherfordium105DbDubnium106SgSeaborgium107BhBohrium108HsHassium109MtMeitnerium110DsDarmstadtium111RgRoentgenium112CnCopernicium113NhNihonium114FlFlerovium115McMoscovium116LvLivermorium117TsTennessine118OgOganesson
8119UueUnunennium120UbnUnbinilium121-126
Ubu-Ubh
57LaLanthanum58CeCerium59PrPraseodymium60NdNeodymium61PmPromethium62SmSamarium63EuEuropium64GdGadolinium65TbTerbium66DyDysprosium67HoHolmium68ErErbium69TmThulium70YbYtterbium71LuLutetium
89AcActinium90ThThorium91PaProtactinium92UUranium93NpNeptunium94PuPlutonium95AmAmericium96CmCurium97BkBerkelium98CfCalifornium99EsEinsteinium100FmFermium101MdMendelevium102NoNobelium103LrLawrencium
121UbuUnbiunium122UbbUnbibium123UbtUnbitrium124UbqUnbiquadium125UbpUnbipentium126UbhUnbihexium127UbsUnbiseptium

Indicators

Litmus

The colourant of natural origin - one of the first and most well-known acid-base (pH) indicators.

Acid
[H+] > [OH-] pH = 0
Neutral
[H+] = [OH-] pH = 7
Alkaline
[OH-] > [H+] pH = 14