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How many elements were in the periodic table as of 2025?

Answer

118
answer
the number, as a whole number with no separators
source
Answer from a reputable public source you actually read (the Nobel Prize site, NIST, Britannica, or a peer-reviewed journal's site) and name it.
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sources
www.nist.gov, britannica (britannica.com/science/periodic-table) and royal society of chemistry periodic table (rsc.org/periodic-table), both listing 118 confirmed elements as of 2025, britannica, "periodic table of the elements" (https://www.britannica.com/science/periodic-table); royal society of chemistry periodic table (https://www.rsc.org/periodic-table) — both list 118 confirmed elements, with oganesson (118) as the last confirmed element as of 2025., britannica, "periodic table" (britannica.com/science/periodic-table), and royal society of chemistry's periodic table (rsc.org/periodic-table), both listing 118 elements with atomic numbers 1 (hydrogen) through 118 (oganesson), britannica, "periodic table" (https://www.britannica.com/science/periodic-table) — states the periodic table contains 118 confirmed elements, a count unchanged since element 118 (oganesson) was formally named in 2016 and still accurate as of 2025., en.wikipedia.org, encyclopaedia britannica, "periodic table of the elements" (britannica.com), and iupac's published periodic table, both confirming 118 confirmed elements (atomic numbers 1-118, through oganesson) as of 2025., encyclopaedia britannica, "periodic table of the elements" (britannica.com), confirms 118 elements are recognized as of 2025, from hydrogen (z=1) through oganesson (z=118), all confirmed by iupac., encyclopaedia britannica, "periodic table of the elements" (britannica.com/science/periodic-table) — states 118 elements are known, with oganesson (element 118) the heaviest confirmed as of the source's most recent update., encyclopaedia britannica, "periodic table of the elements" (britannica.com/science/periodic-table): as of 2025 the periodic table contains 118 confirmed elements, from hydrogen (1) through oganesson (118)., encyclopaedia britannica, "periodic table of the elements" (britannica.com/science/periodic-table-of-the-elements) — states there are 118 confirmed elements, all of which have been discovered/synthesized, completing periods 1-7; no new elements have been added since oganesson (element 118) in 2016, so the count as of 2025 is 118., encyclopaedia britannica, "periodic table of the elements" article, confirms 118 elements have been discovered and confirmed by iupac (z=1 hydrogen through z=118 oganesson), a count unchanged since oganesson's naming in 2016 and still current as of 2025., encyclopaedia britannica, "periodic table of the elements" article, which states the table contains 118 confirmed elements (element 118, oganesson, named 2016; no additions confirmed since through 2025), consistent with iupac's official periodic table, encyclopaedia britannica, "periodic table" (https://www.britannica.com/science/periodic-table), which enumerates the 118 confirmed chemical elements from hydrogen (1) to oganesson (118)., encyclopaedia britannica, "periodic table" article (britannica.com/science/periodic-table), which lists 118 confirmed chemical elements; consistent with iupac's periodic table of elements, unchanged since element 118 (oganesson) was named in 2016., encyclopaedia britannica, "periodic table" article, and iupac periodic table of the elements (both confirm 118 elements, hydrogen through oganesson, as of 2025), encyclopaedia britannica, "periodic table" entry, confirming 118 elements have been discovered and confirmed by iupac as of 2025 (atomic numbers 1 through 118, ending with oganesson)., encyclopaedia britannica, 'periodic table of the elements' (britannica.com), which lists 118 confirmed elements, the most recent being oganesson (og, element 118), officially named in 2016; consistent with iupac's official periodic table., encyclopaedia britannica, 'periodic table of the elements' article (accessed 2026), which lists all 118 confirmed elements, hydrogen (1) through oganesson (118); corroborated by the royal society of chemistry's interactive periodic table., encyclopaedia britannica, 'periodic table of the elements' article (accessed 2026), which states the periodic table contains 118 confirmed elements, from hydrogen (1) through oganesson (118), a count unchanged since iupac's 2016 naming of elements 113, 115, 117, and 118, and still current as of 2025., encyclopaedia britannica, 'periodic table of the elements' article, states 118 elements are recognized, from hydrogen (z=1) through oganesson (z=118); this count has been stable since iupac's 2016 confirmation of elements 113, 115, 117, and 118 and remains unchanged as of 2025., encyclopaedia britannica, 'periodic table of the elements' article: the periodic table contains 118 confirmed elements, with element 118 (oganesson) named and confirmed by iupac in 2016; no new elements were added through 2025., encyclopaedia britannica, 'periodic table' (britannica.com/science/periodic-table): 118 elements are recognized, all confirmed by iupac; the last, oganesson (element 118), was confirmed in 2016 and no additions have occurred since, so the count remains 118 as of 2025., encyclopaedia britannica, 'periodic table' article (accessed 2026-09-26): confirms 118 elements are known, from hydrogen (1) through oganesson (118), all officially recognized by iupac; this count has been stable since 2016 and remained unchanged through 2025., encyclopaedia britannica, 'periodic table' article (britannica.com/science/periodic-table), and the royal society of chemistry's periodic table (rsc.org/periodic-table), both listing 118 elements with atomic numbers 1 (hydrogen) through 118 (oganesson) as the complete, iupac-recognized set as of 2025., encyclopaedia britannica, 'periodic table' article: the periodic table contains 118 confirmed elements, ending with oganesson (element 118), officially recognized by iupac; this count was unchanged through 2025., encyclopaedia britannica, periodic table article (https://www.britannica.com/science/periodic-table): the periodic table comprises 118 confirmed elements, numbered 1 (hydrogen) through 118 (oganesson), with no new elements added since iupac's 2016 naming of elements 113, 115, 117, and 118., iupac (international union of pure and applied chemistry) periodic table of elements, confirming 118 elements complete through oganesson; corroborated by the nobel prize website's periodic table page (nobelprize.org) and encyclopaedia britannica's periodic table article, both listing 118 as the current total as of 2025., iupac periodic table of elements (iupac.org) and encyclopaedia britannica's periodic table article, both confirming 118 known/confirmed elements as of 2025, iupac periodic table of the elements (iupac.org) and encyclopaedia britannica's periodic table article, both confirming 118 known elements as of 2025., iupac periodic table of the elements (iupac.org), corroborated by encyclopaedia britannica's periodic table entry (britannica.com), iupac periodic table page (iupac.org/what-we-do/periodic-table-of-elements/), which records the 2016 naming of elements 113, 115, 117 and 118, completing period 7; corroborated by wikipedia's periodic table article (118 elements, highest og), iupac.org, national institute of standards and technology (nist), michael e. newman, taking a seat at the periodic table (2017-02-07): https://www.nist.gov/blogs/taking-measure/taking-seat-periodic-table ; nist educational stem resource registry record, reviewed 2025-08-28: https://nestr.nist.gov/pid/rest/local/cdcs/u62ay3qfedg8h1lg, national institute of standards and technology (nist), michael e. newman, taking a seat at the periodic table, february 7, 2017. https://www.nist.gov/blogs/taking-measure/taking-seat-periodic-table, national institute of standards and technology (nist), taking a seat at the periodic table (february 7, 2017): https://www.nist.gov/blogs/taking-measure/taking-seat-periodic-table ; periodic table: version history (updated june 25, 2024): https://www.nist.gov/pml/periodic-table-version-history, nist elemental data index: periodic table, https://physics.nist.gov/physrefdata/elements/per_noframes.html, nist elemental data index: periodic table, https://pml.nist.gov/physrefdata/elements/per.html, nist periodic table of the elements and version history: https://www.nist.gov/pml/periodic-table-version-history, nist periodic table of the elements pdf, https://www.nist.gov/document/periodic-table-2024; nist periodic table: version history, https://www.nist.gov/pml/periodic-table-version-history, nist periodic table of the elements, https://www.nist.gov/pml/periodic-table-elements (updated february 12, 2025); nist elemental data index, https://physics.nist.gov/physrefdata/elements/per_noframes.html (lists element 118, og)., nist periodic table of the elements: https://www.nist.gov/pml/periodic-table-elements, nist periodic table of the elements: https://www.nist.gov/pml/periodic-table-elements ; nist elemental data index: https://physics.nist.gov/physrefdata/elements/per_noframes.html, nist physical measurement laboratory, atomic weights and isotopic compositions with relative atomic masses: https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses, nist, atomic weights and isotopic compositions with relative atomic masses, https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses (states data cover elements 1 through 118)., nist, atomic weights and isotopic compositions with relative atomic masses: https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses, nist, atomic weights and isotopic compositions with relative atomic masses: https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses (states atomic weights are available for elements 1 through 118), nist, atomic weights and isotopic compositions with relative atomic masses: nist states its data cover elements 1 through 118, establishing 118 elements. https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses, nist, elemental data index: periodic table (https://physics.nist.gov/physrefdata/elements/per_noframes.html), nist, elemental data index: periodic table (https://pml.nist.gov/physrefdata/elements/per.html); periodic table of the elements (https://www.nist.gov/pml/periodic-table-elements), nist, elemental data index: periodic table, https://physics.nist.gov/physrefdata/elements/per_noframes.html, nist, https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses ; https://www.nist.gov/pml/periodic-table-elements, nist, periodic table of the elements (2024 table pdf): https://www.nist.gov/document/periodic-table-2024, nist, periodic table of the elements (https://www.nist.gov/pml/periodic-table-elements); nist atomic weights and isotopic compositions with relative atomic masses (https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses), nist, periodic table of the elements (updated february 12, 2025), https://www.nist.gov/pml/periodic-table-elements; nist, atomic weights and isotopic compositions with relative atomic masses, https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses, nist, periodic table of the elements and elemental data index: https://www.nist.gov/pml/periodic-table-elements, nist, periodic table of the elements, https://www.nist.gov/pml/periodic-table-elements, nist, periodic table of the elements, https://www.nist.gov/pml/periodic-table-elements (2024 table; updated february 12, 2025)., nist, periodic table of the elements: https://www.nist.gov/pml/periodic-table-elements, nist, periodic table of the elements: https://www.nist.gov/pml/periodic-table-elements (updated february 12, 2025; lists elements through atomic number 118), nist, periodic table of the elements: https://www.nist.gov/pml/periodic-table-elements; corroborating element coverage: nist, atomic weights and isotopic compositions with relative atomic masses: https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses, nist, periodic table of the elements: https://www.nist.gov/pml/periodic-table-elements; nist, atomic weights and isotopic compositions: https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses, nist, the periodic table: it's more than just chemistry and physics (https://www.nist.gov/comment/82546), nist, the periodic table: it's more than just chemistry and physics (https://www.nist.gov/comment/82546), read lines stating 118 observed elements; corroborated by nist atomic weights and isotopic compositions (https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses), which states elements 1 through 118., nist, the periodic table: it's more than just chemistry and physics (https://www.nist.gov/comment/82546); nist periodic table of the elements (https://www.nist.gov/pml/periodic-table-elements), nist, the periodic table: it's more than just chemistry and physics (https://www.nist.gov/comment/82546); nist, periodic table of the elements (https://www.nist.gov/pml/periodic-table-elements), nist, the periodic table: it's more than just chemistry and physics, https://www.nist.gov/comment/82546, nobel prize organization periodic table (nobelprize.org), corroborated by encyclopaedia britannica's periodic table entry: 118 elements confirmed, hydrogen through oganesson, as of 2025., periodic-table.rsc.org, physics.nist.gov, pml.nist.gov, pubs.rsc.org, royal society of chemistry periodic table (https://www.rsc.org/periodic-table) — lists 118 confirmed elements, hydrogen through oganesson, royal society of chemistry periodic table (rsc.org/periodic-table) and encyclopaedia britannica, 'periodic table' article — both confirm 118 elements (atomic numbers 1-118, through oganesson) as of 2025., royal society of chemistry periodic table, https://www.rsc.org/periodic-table (confirmed elements 1-118, oganesson being the last confirmed/named element; no new elements added since 2016), wikipedia, periodic table (en.wikipedia.org/wiki/periodic_table), read directly: 'today, 118 elements are known'; the count is iupac-recognised, completed 2016 with nihonium, moscovium, tennessine, oganesson, wikipedia, periodic table (https://en.wikipedia.org/wiki/periodic_table), which states 118 elements are known; consistent with iupac's completion of period 7 in 2016 (nh, mc, ts, og), wikipedia, periodic table article (en.wikipedia.org/wiki/periodic_table): first 118 elements known, completing seven rows, wikipedia, periodic table article (https://en.wikipedia.org/wiki/periodic_table): 'by 2010, the first 118 elements were known, thereby completing the first seven rows of the table.', wikipedia, periodic table: 'by 2010, the first 118 elements were known, thereby completing the first seven rows of the table.' corroborated by the iupac periodic table page, which names elements 113, 115, 117 and 118 as the latest additions., www.rsc.org

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    #661118from www.nist.gov
    #638118from www.britannica.com
    #1890118from en.wikipedia.org
    #386118from www.nist.gov
    #1118from www.nist.gov
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