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The 189 pages that link to Periodic table, each with the reason it gives.

• Electron configurationNarrower topic: Its blocks and periods reflect recurring patterns in electron configurations.

• Superheavy elementNarrower topic: New superheavy elements test how far its patterns extend.

• PotassiumNarrower topic: Potassium’s position in Group 1 and Period 4 summarizes key patterns in its properties.

• ChlorineNarrower topic: Chlorine’s group and period help predict its electron structure and chemical behavior.

• CalciumNarrower topic: Calcium’s position places it in Group 2 and Period 4.

• Rare-earth elementNarrower topic: The lanthanides occupy a distinct series whose placement helps explain the group’s boundaries.

• SodiumNarrower topic: Sodium’s position in Group 1 and Period 3 predicts its chemical family and structure.

• Alkali metalNarrower topic: Group 1 places these elements together because they share a single outer-shell electron.

• Ionization energyNarrower topic: Ionization energy follows recognizable patterns across periods and down groups.

• Noble gasNarrower topic: Group 18 places these elements together because their properties recur with similar outer-shell structures.

• Superheavy element synthesisNarrower topic: Each confirmed synthesis extends the experimentally established boundary of the table.

• LanthanideNarrower topic: The f-block placement makes the lanthanide series legible within element classification.

• Dmitri MendeleevNarrower topic: Mendeleev's table became the model for the modern arrangement of the elements.

• Extended periodic tableNarrower topic: The extended table extrapolates the structure of this standard chemical reference.

• Periodic trendsNarrower topic: Its periods and groups are the directions along which periodic trends are measured.

• Lanthanide contractionNarrower topic: The lanthanide series occupies a distinctive position in the table's sixth period.

• ActinideNarrower topic: The actinides form the lower of the two rows usually placed beneath the main table.

• CarbonNarrower topic: Carbon’s position in group 14 helps explain its four-valence-electron chemistry.

• Electron affinityNarrower topic: Electron affinity varies across the table, but the trends include notable exceptions.

• NihoniumNarrower topic: Nihonium occupies group 13 and period 7 in this arrangement.

• HalogenNarrower topic: Halogens occupy group 17, where similar outer-electron structures produce recurring properties.

• Octet ruleNarrower topic: For main-group elements, the group often indicates the number of valence electrons relevant to octet counting.

• TinNarrower topic: Tin’s group and period place it among elements with related chemical behavior.

• AtomNarrower topic: Its patterns arise largely from the electron structures of atoms.

• BerylliumNarrower topic: Beryllium’s position among group 2 elements predicts some of its chemistry.

• MetalloidNarrower topic: Metalloids cluster near the table’s zigzag boundary between metals and nonmetals.

• Relativistic chemistryNarrower topic: Relativistic effects explain departures from simple periodic trends among the heaviest elements.

• Atomic radiusNarrower topic: Radius patterns help explain the table's recurring changes across rows and columns.

• Relativistic effectNarrower topic: Relativistic effects become especially consequential among its heaviest elements.

• Transactinide elementNarrower topic: Transactinides extend the table beyond its traditional actinide region.

• MoscoviumNarrower topic: Moscovium occupies group 15 and period 7 in the periodic table.

• PalladiumNarrower topic: Palladium’s position in period 5 and group 10 links it to neighboring transition metals.

• ThoriumNarrower topic: Thorium’s position among the actinides reflects its atomic number and chemical behavior.

• BismuthNarrower topic: Bismuth’s position among the elements helps predict its chemical behavior.

• Relative atomic massNarrower topic: Its conventional element values commonly report standard atomic weights derived from relative atomic masses.

• Alkaline earth metalNarrower topic: Group 2 is one vertical family within this map of elemental properties.

• SeleniumNarrower topic: Selenium’s position among the chalcogens helps predict its properties.

• XenonNarrower topic: Xenon’s position in Group 18 shaped early predictions that it would be chemically inert.

• GalliumNarrower topic: Gallium occupies group 13, period 4, among elements with three valence electrons.

• Inert-pair effectNarrower topic: The effect is a periodic trend concentrated among heavier p-block elements.

• RubidiumNarrower topic: Rubidium’s position in Group 1 predicts its broad chemical behavior.

• Albert GhiorsoNarrower topic: Each confirmed discovery Ghiorso helped make added a place to the expanding table.

• ArgonNarrower topic: Argon occupies group 18 and period 3 in this arrangement.

• Emilio SegrèNarrower topic: Technetium and astatine filled gaps in the table with experimentally identified elements.

• FleroviumNarrower topic: Flerovium’s placement in period 7 and group 14 frames its expected chemistry.

• Moseley's lawNarrower topic: The law supplied a physical basis for the table’s ordering.

• ChalcogenNarrower topic: Chalcogens occupy its sixteenth column, whose members share recurring valence-electron patterns.

• Chemical element namingNarrower topic: Element names and symbols appear in the shared framework used to organize the elements.

• CoperniciumNarrower topic: Its position in the table places copernicium among the transactinides.

• d-blockNarrower topic: The d-block is one of the table’s broad regions, placed between the s- and p-blocks.